fix(http): reject compromised Node header processing

[kwakayama]

Node header processing can expose infrastructure credentials through mutable native callbacks or conversion helpers. This change checks the selected callback/iterator dependencies and ambient RequestInit defaults, including Node’s dispatcher, before processing. Hosted invocation preparation removes infrastructure headers before native HeadersInit conversion and checks native state after payload serialization. The request-field policy is frozen.

Clean requests retain native headers, content types, body-transfer behavior and host error identity. Detected unsafe processing rejects explicitly without dispatching a partial request. The bounded contract and residual limits are documented in docs/architecture/native-request-processing.md.

Validation:

• Local red/green reproduction for callback and iterator exposure, inherited defaults, sanitizer exposure, asynchronous mutation, payload serialization and isProxy conversion.
• Focused Node 22/24/25, Deno 2.7.7 and Bun 1.3.11 controls; ordinary route compatibility tests pass.
• Exact packed-artifact public-helper and compiled hosted-route probes pass on Node 22/24 with zero infrastructure-token observations and zero fetches. The isProxy case completes with sanitized headers/body.
• Native guard coverage: 100% lines and 89.47% branches. Sonar quality gate, typecheck, lint, test inventories and all CI checks pass.
• Final local Codex review: 94/100, zero actionable findings on 5689f72f6a191d156c254d91bc23fe60a3526b6f. All review threads are resolved.

Tracks veryfront/veryfront-issue-inbox#1037. This PR does not close it. A body-stream cloning exposure reproduces identically on the pre-PR baseline and this commit and remains unfixed in the shared-realm body/process-isolation work. Native body cloning/reading, complete credential isolation, exact staging-artifact verification and a separate authenticated hosted-run control remain outside this mitigation and are explicitly tracked in #1037.

[coderabbitai]

📝 Walkthrough

Walkthrough

The change adds Node-specific checks for modified native header processing and inherited RequestInit defaults. It applies these checks across agent and application request paths, adds integration coverage, updates runtime test inventories, and documents the processing model.

Changes

Native request processing

Layer / File(s)	Summary
Native processing guards src/security/http/native-header-processing.ts, src/security/http/native-request-processing.ts	Adds Node-only validation for native callback dispatch, header iteration, and inherited RequestInit fields.
Request-path enforcement src/security/http/application-request.ts, src/agent/service/definition.ts, src/agent/service/routes.ts	Runs native processing checks before and after header sanitization, request construction, and runtime invocation operations.
Integration validation and runtime coverage tests/integration/agent/*, tests/integration/security/application-request.test.ts, tests/integration/agent/fixtures/*, scripts/test/run-suite.*, docs/architecture/native-request-processing.md	Adds tests for credential exposure, tampered native APIs, inherited defaults, request compatibility, runtime invocation, test discovery, and documented runtime behavior.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🔵 Low · up to 2fe80

A regression in one sanitizer could evade this security test. Require both failures before merging.

Sequence Diagram(s)

sequenceDiagram
  participant AgentRuntime
  participant RequestGuards
  participant NativeRequest
  AgentRuntime->>RequestGuards: validate native headers and RequestInit defaults
  RequestGuards-->>AgentRuntime: allow or throw TypeError
  AgentRuntime->>NativeRequest: construct sanitized request
  NativeRequest-->>AgentRuntime: return request or native error
  AgentRuntime->>RequestGuards: revalidate after header and request processing

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 31.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 12 files. (1 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: rejecting compromised Node header-processing operations.

Full details: Docstring Coverage

Explanation

Docstring coverage is 31.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 12 files. (1 skipped: 1 unsupported.)

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• Commit unit tests in branch fix/issue-1037-header-processing-20260908

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[github-actions]

📦 Client bundle boundary

Entrypoint	Modules	Source size	Server leaks
src/index.client.ts	289	2303 KiB	✅ 0

A server module in a client graph aborts hydration in the browser. New leaks fail CI; known leaks are tracked in scripts/lint/client-bundle-baseline.json to burn down.

[kwakayama]

Progress update:

• Local red/green reproduced the reported callback exposure (2 observations), native iterator exposure (2), inherited RequestInit accessors, and application sanitization exposure (2). The guarded paths now reject explicitly with zero observations and retain clean native compatibility/error controls.
• Pinned Deno 2.7.7 typechecking and the focused cross-runtime suites pass. A packed npm artifact tested through veryfront/agent in a clean-environment process reports zero observations, zero fetches, three rejected compromised requests, and one clean request.
• Local Codex review of db44ecea8 found a P1: the exported RequestInit field list was mutable. The next update freezes it and adds a public-request regression for the bypass. That historical review is not approval of the final PR.
• Hosted route preparation has a passing local red/green regression; its native CI placement is being finalized.
• Full unit validation reached isolated-worker tests that returned 403 instead of the expected 200/204. Baseline comparison is in progress; no full-suite pass is claimed.

On the suggestion to add colocated tests for the guards: the kept regressions exercise the real service helper, sanitizer and hosted route interfaces, including errors and rejected dispatch. The runtime inventories explicitly include these integration tests on Node and Bun. This tests the actual credential-processing behavior instead of duplicating the guard implementation in isolated helper tests.

The PR remains draft while final tests, local Codex review and CI complete. This is a bounded mitigation; exact staging-artifact and authenticated hosted-run verification remain part of issue #1037.

[codecov]

Codecov Report

❌ Patch coverage is 78.43137% with 22 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/security/http/native-header-processing.ts	50.00%	11 Missing and 5 partials ⚠️
src/security/http/native-request-processing.ts	81.25%	5 Missing and 1 partial ⚠️

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-08T08:28:43.531624Z	5689f72	Manual request
🔒 Security Review	✅ Completed 2026-09-08T07:42:41.560245Z	c2132ce	New commits

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@codex review

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@codex review

[kwakayama]

Local Codex review, historical candidate. The finding below is fixed in the subsequent dispatcher commit, with helper and hosted-path red/green regressions. A new review is running for that commit.

The focused Node/Deno regressions and source typechecks pass, but the additional synthetic probe confirms an ambient RequestInit field can still expose hosted credentials. Bun verification is partial; no staging verification is claimed.

Review-Gate:
Reviewer: Codex
Reviewed-SHA: 40c79dc
Score: 69/100
Actionable-Findings: 1
Verdict: REQUEST_CHANGES

Review comment:

• [P1] Reject ambient dispatcher defaults before native construction — src/security/http/native-request-processing.ts:12-14
  On Node, an Object.prototype.dispatcher getter installed after initialization bypasses this guard because dispatcher is absent from the field list, although Undici reads it during RequestInit conversion. In hosted invocation preparation, new NativeRequest(...) receives unsanitized headers before createApplicationRequest runs, so this getter can read the inference credential through this.headers. A synthetic route probe installed the getter during verification: it observed the canary twice and execution preparation still ran without rejection. This violates the ambient-default contract, without changing private native state or other intrinsics. Include this native field in the rejection policy and add a hosted-path regression.
  The focused Node/Deno regressions and source typechecks pass, but the additional synthetic probe confirms an ambient RequestInit field can still expose hosted credentials. Bun verification is partial; no staging verification is claimed.

Review-Gate:
Reviewer: Codex
Reviewed-SHA: 40c79dc
Score: 69/100
Actionable-Findings: 1
Verdict: REQUEST_CHANGES

Review comment:

• [P1] Reject ambient dispatcher defaults before native construction — src/security/http/native-request-processing.ts:12-14
  On Node, an Object.prototype.dispatcher getter installed after initialization bypasses this guard because dispatcher is absent from the field list, although Undici reads it during RequestInit conversion. In hosted invocation preparation, new NativeRequest(...) receives unsanitized headers before createApplicationRequest runs, so this getter can read the inference credential through this.headers. A synthetic route probe installed the getter during verification: it observed the canary twice and execution preparation still ran without rejection. This violates the ambient-default contract, without changing private native state or other intrinsics. Include this native field in the rejection policy and add a hosted-path regression.

[Copilot]

🔵 Needs a closer look

It changes security-critical request/header boundary enforcement in Node and should receive final human review focused on threat-model fit and forward-compatibility of the intrinsic/protocol checks.

Pull request overview

This PR hardens Veryfront’s Node request and header handling against compromised native callback dispatch, modified header iteration, and ambient/inherited RequestInit defaults by adding precondition checks at key security boundaries (service request helper, application-request sanitizer, and hosted invocation preparation), backed by new integration tests and a short architecture note describing the supported preconditions and limitations.

Changes:

• Add Node-only precondition checks for native header processing integrity and ambient RequestInit defaults, and re-check after potentially re-entrant option/header access.
• Extend integration coverage for compromised callback/iterator exposure, inherited defaults, and hosted invocation preparation (including async mutation timing).
• Update suite inventories and add documentation describing the intended guarantees and residual shared-realm limits.

File summaries

File	Description
tests/integration/security/application-request.test.ts	Adds regression coverage ensuring sanitizer paths reject compromised callback dispatch without credential exposure.
tests/integration/agent/service-request-defaults.test.ts	Adds coverage for rejecting ambient/inherited RequestInit defaults on Node and freezing the RequestInit field policy.
tests/integration/agent/service-native-invocation.test.ts	Adds Node regression ensuring async hosted invocation rejects mutated header iteration before copying credentials.
tests/integration/agent/service-header-boundary.test.ts	Adds broad boundary coverage for callback/iterator compromise, re-entrant getters, compatibility, and error identity.
tests/integration/agent/fixtures/native-header-package-probe.mjs	Adds an installed-package probe script to validate rejections/clean requests without external fetches in a Node-only probe scenario.
src/security/http/native-request-processing.ts	Introduces assertNativeRequestDefaults() and a frozen RequestInitFields policy to detect ambient Node defaults pre-construction.
src/security/http/native-header-processing.ts	Introduces assertNativeHeaderProcessing() to detect modified callback dispatch and header iterator protocol on Node.
src/security/http/application-request.ts	Adds precondition checks around application-request sanitization, including re-checks after option normalization.
src/agent/service/routes.ts	Adds precondition checks in hosted invocation preparation and execute handler around clone, header copying, and request construction.
src/agent/service/definition.ts	Integrates precondition checks into header copying/replacement and service request construction, re-checking after init copying.
scripts/test/run-suite.ts	Adds new integration tests to Node and Bun suite patterns.
scripts/test/run-suite.test.ts	Updates suite inventory parity assertions for the newly added integration tests.
docs/architecture/native-request-processing.md	Documents the Node preconditions, threat model boundaries, and verification expectations.

Review details

• Files reviewed: 13/13 changed files
• Comments generated: 0
• Review effort level: Lite

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Code Review ✅ Approved 2 resolved / 2 findings

Hardens Node header processing to prevent credential exposure through native callback replacement or iterator manipulation, and guards against inherited RequestInit defaults affecting helper requests. Security validation across Node 22/24/25, Deno, and Bun confirms zero credential observations in packed-artifact probes with explicit rejection paths. The request-field policy is now frozen to prevent option-copying bypasses.

✅ 2 resolved

✅ Quality: New security modules lack colocated unit tests

📄 src/security/http/native-header-processing.ts:23-37 📄 src/security/http/native-request-processing.ts:27-33
The two new source modules src/security/http/native-header-processing.ts and src/security/http/native-request-processing.ts have no colocated *.test.ts files, though the repo convention is to keep unit tests next to source. Their behavior is exercised only indirectly through tests/integration/. Consider adding colocated unit tests that assert assertNativeHeaderProcessing/assertNativeRequestDefaults throw the expected TypeError on tampering and are no-ops off Node, to directly pin the module contracts.

✅ Quality: New test file omits describe() wrapper

📄 tests/integration/agent/service-native-invocation.test.ts:7 📄 tests/integration/agent/service-native-invocation.test.ts:46
tests/integration/agent/service-native-invocation.test.ts registers a top-level it() and imports only it from bdd.ts, whereas the project convention (and the sibling service-request-defaults.test.ts) groups cases under a describe() block. Wrap the case in a describe() and import it alongside it for consistency with the stated testing convention.

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Codex Review: Didn't find any major issues. What shall we delve into next?

Reviewed commit: 2fe80dc723

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[kwakayama]

Local Codex CLI review of the exact final commit:

No actionable regressions or bounded-contract gaps found in the exact committed diff. Focused Deno, Node and Bun tests, 66 synthetic rejection checks, implementation typechecking and suite-inventory checks passed; Bun hosted-import coverage remains blocked by workspace resolution, and installed-package/staging validation was not performed. Score breakdown: correctness 40/40, testing 17/20, reliability/security 14/15, standards 15/15, scope/docs 10/10.

Review-Gate:
Reviewer: Codex
Reviewed-SHA: 2fe80dc
Score: 96/100
Actionable-Findings: 0
Verdict: APPROVE

[kwakayama]

Exact final package validation for 2fe80dc723a86da57b74adabf8958338c0f0f2ab passed.

• Built from an isolated git archive of that commit with Deno 2.7.7. The initial frozen task encountered a JSR cache checksum error; the DNT build passed after reloading the affected upstream cache entry. No dependency versions or lockfiles changed.
• Packed artifact SHA-256: a84f8aeef8f5bac1a66565fc07b287395b9d573533310ab7304d432919b2ce49.
• Public veryfront/agent probe from the packed artifact: Node 22.23.2 / Undici 6.28.0 and Node 24.20.0 / Undici 7.29.0 both report observations=0, fetches=0, rejected=3, cleanRequests=1.
• Supplemental inherited-dispatcher probe passes on both versions: zero getter reads, setter writes, credential observations and fetches; one explicit rejection and one clean request.
• Dependencies were linked from the local npm build in the isolated validation directory. This validates the packed output and public package entrypoint, not a registry installation or staging deployment.

Final local Codex review: 96/100, zero actionable findings, APPROVE for the same commit. Focused final source coverage: 21 Node tests passed. Full local unit validation passed 4,536 tests / 38,641 steps on the preceding candidate; the final dispatcher-only addition has fresh targeted red/green, typecheck/lint, Deno and Bun controls. All review threads are resolved; waiting for the remaining CI jobs before merge.

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Actionable comments posted: 1

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Inline comments:
In `@tests/integration/security/application-request.test.ts`:
- Line 51: Update the assertion in the failure-handling test to require exactly
two failures before validating their types, ensuring both
createApplicationRequestHeaders() and createApplicationRequest() reject the
replacement path.

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ℹ️ Review info

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Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 7022caee-c6be-4b81-b43b-e68f404118ae

📥 Commits

Reviewing files that changed from the base of the PR and between 2f84f22 and 2fe80dc.

📒 Files selected for processing (13)

• docs/architecture/native-request-processing.md
• scripts/test/run-suite.test.ts
• scripts/test/run-suite.ts
• src/agent/service/definition.ts
• src/agent/service/routes.ts
• src/security/http/application-request.ts
• src/security/http/native-header-processing.ts
• src/security/http/native-request-processing.ts
• tests/integration/agent/fixtures/native-header-package-probe.mjs
• tests/integration/agent/service-header-boundary.test.ts
• tests/integration/agent/service-native-invocation.test.ts
• tests/integration/agent/service-request-defaults.test.ts
• tests/integration/security/application-request.test.ts

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[kwakayama]

Updated head: 667d6f21e8271020968419762a1c6a3a9174f8e5. The only changes since the reviewed production implementation are eight test/coverage lines:

• Both sanitizers must explicitly reject changed native callback dispatch on Node (exactly two TypeErrors); Deno/Bun retain native success behavior.
• The existing native coverage collector includes the two guard modules and their four integration files. Previously the regressions ran but their native coverage was not uploaded, causing Sonar's 75.5% new-code coverage failure.

Actual source-mapped Node coverage now reports 100% lines and 89.47% branches across the two guards, with all 21 focused tests passing. Thresholds and exclusions are unchanged. The existing full collector's TLS socket-limit test times out on this local macOS environment on Node 22/25; it passed on the preceding Linux CI run, and the updated job will verify the expanded collector in CI.

Production sources are unchanged from 2fe80dc723a86da57b74adabf8958338c0f0f2ab, whose packed artifact passed the Node 22/24 probes. Local Codex review is restarting for the new commit. Merge remains gated on all comments being resolved and CI green.

[github-actions]

@codex review

[kwakayama]

Local Codex CLI final review after the sanitizer assertion and native coverage additions:

No actionable regressions or bounded-contract gaps found in the exact committed diff. Focused Deno/Node tests, inventory checks, typecheck, lint, and diff checks passed; Bun hosted-invocation loading and deployment verification remain validation gaps.

Review-Gate:
Reviewer: Codex
Reviewed-SHA: 667d6f2
Score: 95/100
Actionable-Findings: 0
Verdict: APPROVE

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Reviewed commit: 667d6f21e8

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Local Codex CLI final review after the serialization red/green fix:

No actionable regressions or bounded-contract gaps found in the exact committed diff; targeted tests pass on Deno and three Node versions. Bun hosted-invocation loading and broader offline typechecking remain verification gaps, and no staging verification is claimed.

Review-Gate:
Reviewer: Codex
Reviewed-SHA: c2132ce
Score: 94/100
Actionable-Findings: 0
Verdict: APPROVE

[kwakayama]

Exact current-commit artifact verification passed for c2132ce6a6c929ee66130ae519c883c936dabee9.

• Packed artifact SHA-256: 7f015d600e00cbd8b3ccc024011ca0947ee18ed95f46a56acb79cc5ca9b90096.
• The emitted route implementation serializes the body before both native-state assertions and Request construction.
• Clean-environment public veryfront/agent probe, Node 22.23.2 and 24.20.0: zero credential observations, zero fetches, three explicit rejections and one clean request.
• Supplemental dispatcher probe on both versions: zero getter reads, setter writes, credential observations or fetches.
• Hosted route regressions: iterator, dispatcher and serialization mutations all pass on both Node versions (3/3 each).

The exact git-archive input was built using pinned Deno 2.7.7, with the same targeted dependency-cache reload noted previously. This validates locally packed output with built dependencies, not a published or staging artifact.

Final local Codex review approved this commit at 94/100 with zero actionable findings. All posted review threads are resolved. CI is still running; merge remains conditional on green CI.

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Reviewed commit: c2132ce6a6

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[kwakayama]

Sonar quality gate passes at 98.5% new-code coverage and 0% duplication. I reviewed its five non-blocking code-smell notes: four flag deliberate prototype replacement/restoration in the isolated synthetic package probe; the fifth recommends for-of in the native RequestInit guard. These are intentional: the probe must reproduce hostile prototype changes, and the guard uses indexed iteration to avoid a replaceable iterator while validating native state. No production defect is identified by those notes, and no threshold or exclusion was changed.

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@codex review

[kwakayama]

Local Codex CLI final review of early infrastructure-header sanitization:

No actionable regressions or bounded-contract gaps were found in the exact committed diff. Focused Node/Deno tests, adjacent Deno regressions, inventory checks, lint, and diff checks passed; Bun verification remains partial because a local extension dependency is missing.

Review-Gate:
Reviewer: Codex
Reviewed-SHA: 5689f72
Score: 94/100
Actionable-Findings: 0
Verdict: APPROVE

[kwakayama]

Exact artifact validation passed for 5689f72f6a191d156c254d91bc23fe60a3526b6f.

• Tarball SHA-256: 92f91b0b558a32987c281d33a7c8b5affc4638a195385ffcbbe9527528c207ab.
• Public veryfront/agent helper probes pass on Node 22.23.2 and 24.20.0 with zero observations/fetches, three explicit rejections and one clean request. Dispatcher probes also report zero reads, writes, observations and fetches.
• The hosted isProxy scenario imports compiled service/routes.js directly from the extracted tarball: both Node versions report zero observations/fetches, status202, one detached dispatch, and sanitized headers/body. This is separate from the public-helper probe.
• All four tracked hosted mutation cases (iterator, dispatcher, serialization, isProxy) pass on both Node versions.
• The emitted route removes infrastructure headers before native conversion. Its SHA-256 is 1e99886597ac6c71d6b2a7478d11dbe5e63533c8f34764d51ded33d1bd850047.

The package was built from the exact git archive with the pinned toolchain and built local dependencies. These are synthetic local package/component controls, not staging or authenticated hosted-run verification. All current review threads are resolved; final CI is running.

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Reviewed commit: 5689f72f6a

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[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
98.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[kwakayama]

@codex review

Please re-review the current commit against the bounded header-processing contract in the PR description and docs/architecture/native-request-processing.md.

The body-stream finding has been confirmed to reproduce identically on pre-PR base 3ee45cb and current head. The unchanged initial RequestClone predates this PR. It remains explicitly unfixed and tracked in veryfront/veryfront-issue-inbox#1037; the PR description now states that body cloning/reading and complete shared-realm isolation are outside this mitigation. This PR does not close #1037.

Please assess whether the scoped header-processing changes are safe to merge with that documented limitation, and report any regressions or remaining gaps within that contract. All tests/quality checks are green, exact-package probes pass, and the current local Codex review is94/100 with zero actionable bounded-contract findings. The prior review finding is not being represented as fixed.

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Codex Review: Didn't find any major issues. Hooray!

Reviewed commit: 5689f72f6a

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[kwakayama]

Merged #4455 through the required merge queue on September 8, 2026 at 08:54 UTC.

• Merge commit: ebf4ef38e72bb814260d8a17a7ec4c981607be48; reviewed PR head: 5689f72f6a191d156c254d91bc23fe60a3526b6f.
• Bounded fix: explicit rejection of selected unsafe native callback/iterator and RequestInit processing; frozen request-field policy; infrastructure headers sanitized before native conversion; native state checked after serialization.
• Local red/green regressions and Node/Deno/Bun controls passed. Exact packed-artifact public-helper and compiled hosted-route probes passed on Node 22/24 with zero infrastructure-token observations or fetches.
• Final local Codex review: 94/100, zero actionable bounded-contract findings.
• 45 PR checks passed, all six review threads were resolved, and the merge-queue checks passed. The 13 conditional release/schedule/merge-group skips were verified against workflow conditions; no repository merge protection was bypassed.

Issue #1037 remains OPEN. The pre-existing body-stream cloning exposure is still unfixed and recorded in the issue’s remaining-work section. Stronger body/process isolation, exact deployed staging-artifact verification and a separately recorded authenticated hosted-run control are outstanding. This merge is not complete credential-isolation or staging proof.