diff --git a/.changeset/bundle-h3-cookie.md b/.changeset/bundle-h3-cookie.md
new file mode 100644
index 000000000..cd1e7bc55
--- /dev/null
+++ b/.changeset/bundle-h3-cookie.md
@@ -0,0 +1,5 @@
+---
+"@solidjs/start": patch
+---
+
+Bundle `h3` and `cookie-es` into server builds to avoid resolving incompatible hoisted versions
diff --git a/packages/start/src/config/index.ts b/packages/start/src/config/index.ts
index 447f26ab7..b40c21ddb 100644
--- a/packages/start/src/config/index.ts
+++ b/packages/start/src/config/index.ts
@@ -158,7 +158,14 @@ export function solidStart(options?: SolidStartOptions): Array<PluginOption> {
             },
             // Depending on the package manager and dependency structure Vite externalizes @solidjs/start
             // This makes sure that @solidjs/start goes through the Vite build process
-            noExternal: ["@solidjs/start"],
+            //
+            // h3 and cookie-es must be bundled as well: if they stay external, the server build
+            // emits bare imports that nitro later re-resolves from the project root, where package
+            // managers like yarn may have hoisted the older major versions required by nitropack
+            // and unstorage (h3 v1 / cookie-es v1) instead of the versions @solidjs/start needs
+            // (see https://github.com/solidjs/solid-start/issues/2101
+            // and https://github.com/solidjs/solid-start/issues/2178)
+            noExternal: ["@solidjs/start", "h3", "cookie-es"],
           },
           define: {
             "import.meta.env.MANIFEST": `globalThis.MANIFEST`,