diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e949339fc..2b690b100 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -346,6 +346,37 @@ jobs:
       - run: tar -xzf "$RUNNER_TEMP/native-linux-x64-gnu.tar.gz"
       - run: pnpm test tests/harness/effect.test.ts tests/harness/effect4.test.ts
 
+  # The sanitized three.js nodes build alone: beside the san corpus's other
+  # workers it took 860 to more than 1200 seconds of its shard
+  # (SCRIPTC_THREE_SANITIZED_NODES_JOB in scripts/ci-test-plan.mjs). It keeps
+  # the corpus's LeakSanitizer settings.
+  three_nodes_san:
+    needs: [validation_scope, lanes, native_linux]
+    if: ${{ needs.validation_scope.outputs.full == 'true' && needs.lanes.outputs.linux == 'true' }}
+    name: test (Linux, san, three.js nodes)
+    runs-on: ubuntu-24.04
+    timeout-minutes: 40
+    env:
+      SCRIPTC_SAN: "1"
+      ASAN_OPTIONS: detect_leaks=1
+      LSAN_OPTIONS: suppressions=${{ github.workspace }}/tests/harness/lsan.supp:print_suppressions=0
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 11.1.3
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: .node-version
+          cache: pnpm
+      - run: pnpm install --frozen-lockfile
+      - uses: actions/download-artifact@v4
+        with:
+          name: native-linux-x64-gnu
+          path: ${{ runner.temp }}
+      - run: tar -xzf "$RUNNER_TEMP/native-linux-x64-gnu.tar.gz"
+      - run: pnpm test tests/harness/three.test.ts -t "'nodes' runs statically through LLVM on 'native'"
+
   # Build each instrumented seed once. Downstream contracts retain the same
   # compiler and source artifacts without repeating seed construction.
   bootstrap_seed:
@@ -950,6 +981,7 @@ jobs:
         tests_macos,
         native_linux,
         effects,
+        three_nodes_san,
         bootstrap_seed,
         bootstrap,
         linux_host_clang,
@@ -982,6 +1014,7 @@ jobs:
               lane tests_macos "${{ needs.tests_macos.result }}" "${{ needs.lanes.outputs.macos }}"
               lane native_linux "${{ needs.native_linux.result }}" "${{ needs.lanes.outputs.linux }}"
               lane effects "${{ needs.effects.result }}" "${{ needs.lanes.outputs.effects }}"
+              lane three_nodes_san "${{ needs.three_nodes_san.result }}" "${{ needs.lanes.outputs.linux }}"
               lane bootstrap_seed "${{ needs.bootstrap_seed.result }}" "${{ needs.lanes.outputs.bootstrap }}"
               lane bootstrap "${{ needs.bootstrap.result }}" "${{ needs.lanes.outputs.bootstrap }}"
               lane linux_host_clang "${{ needs.linux_host_clang.result }}" "${{ needs.lanes.outputs.linux }}"
diff --git a/scripts/ci-test-plan.mjs b/scripts/ci-test-plan.mjs
index 184f04d1c..88a77e32e 100644
--- a/scripts/ci-test-plan.mjs
+++ b/scripts/ci-test-plan.mjs
@@ -134,6 +134,15 @@ export const leakSuppressions = fileURLToPath(
   new URL("../tests/harness/lsan.supp", import.meta.url),
 );
 
+// The sanitized three.js nodes build runs in its own Linux job
+// (three_nodes_san in .github/workflows/ci.yml). Beside the corpus's other
+// workers it took 860 to more than 1200 seconds, past its test timeout.
+export const sanitizedNodesJobEnv = { SCRIPTC_THREE_SANITIZED_NODES_JOB: "1" };
+
+function corpusThreeEnv(flavor, platform) {
+  return flavor === "san" && platform === "linux" ? sanitizedNodesJobEnv : {};
+}
+
 function corpusLeakEnv(flavor, platform) {
   if (flavor !== "san" || platform !== "linux") return {};
   return {
@@ -246,6 +255,7 @@ export function ciTestPlan({
       env: {
         ...env,
         ...corpusLeakEnv(flavor, platform),
+        ...corpusThreeEnv(flavor, platform),
         SCRIPTC_TEST_WORKERS: String(workers - sideWorkers),
         SCRIPTC_LLVM_TEST_MODE: "dev",
       },
diff --git a/tests/harness/ci-test-plan.test.ts b/tests/harness/ci-test-plan.test.ts
index 29268c841..e67e5582b 100644
--- a/tests/harness/ci-test-plan.test.ts
+++ b/tests/harness/ci-test-plan.test.ts
@@ -12,6 +12,7 @@ import {
   isolatedFiles,
   leakSuppressions,
   memoryHeavyFiles,
+  sanitizedNodesJobEnv,
   sideOwners,
   testCosts,
 } from "../../scripts/ci-test-plan.mjs";
@@ -90,6 +91,42 @@ test("LeakSanitizer runs over the sanitized corpus on Linux only", () => {
   for (const task of plan("san", "linux").side) expect(task.env.ASAN_OPTIONS).toBeUndefined();
 });
 
+test("the sanitized three.js nodes build leaves the Linux corpus for its own job", () => {
+  const plan = (flavor: "plain" | "san", platform: string) =>
+    ciTestPlan({ shard: "1/20", flavor, workers: 4, platform });
+  const [name, value] = Object.entries(sanitizedNodesJobEnv)[0]!;
+  expect(plan("san", "linux").corpus.env[name]).toBe(value);
+  for (const env of [plan("plain", "linux").corpus.env, plan("san", "darwin").corpus.env])
+    expect(env[name]).toBeUndefined();
+  const three = readFileSync(new URL("./three.test.ts", import.meta.url), "utf8");
+  expect(three).toContain(`process.env["${name}"] === "${value}"`);
+  const { jobs } = load(
+    readFileSync(new URL("../../.github/workflows/ci.yml", import.meta.url), "utf8"),
+  ) as {
+    jobs: Record<
+      string,
+      { needs: string[]; env: Record<string, string>; steps: { run?: string }[] }
+    >;
+  };
+  const job = jobs["three_nodes_san"]!;
+  expect(job.needs).toContain("native_linux");
+  expect(jobs["test"]!.needs).toContain("three_nodes_san");
+  expect(job.env[name]).toBeUndefined();
+  expect(job.env["SCRIPTC_SAN"]).toBe("1");
+  // The same LeakSanitizer settings as the corpus it left.
+  const corpus = plan("san", "linux").corpus.env;
+  expect(job.env["ASAN_OPTIONS"]).toBe(corpus.ASAN_OPTIONS);
+  expect(job.env["LSAN_OPTIONS"]).toBe(
+    corpus.LSAN_OPTIONS!.replace(
+      leakSuppressions,
+      "${{ github.workspace }}/tests/harness/lsan.supp",
+    ),
+  );
+  expect(job.steps.at(-1)!.run).toBe(
+    `pnpm test tests/harness/three.test.ts -t "'nodes' runs statically through LLVM on 'native'"`,
+  );
+});
+
 test("the side queue balances measured files across the twenty Linux shards", () => {
   for (const flavor of ["plain", "san"] as const) {
     const costs = testCosts[flavor] as Record<string, number>;
diff --git a/tests/harness/three.test.ts b/tests/harness/three.test.ts
index 27fb86d1f..e55242149 100644
--- a/tests/harness/three.test.ts
+++ b/tests/harness/three.test.ts
@@ -68,6 +68,15 @@ test.for(cases)(
   async ({ fixture, target }, context) => {
     const entry = join(import.meta.dirname, `../fixtures/three/${fixture}.mjs`);
     if (target === "wasm32-wasi" && !hasZig) context.skip();
+    // CI's Linux sanitized lane builds this one in its own job
+    // (scripts/ci-test-plan.mjs).
+    if (
+      fixture === "nodes" &&
+      target === "native" &&
+      process.env["SCRIPTC_SAN"] === "1" &&
+      process.env["SCRIPTC_THREE_SANITIZED_NODES_JOB"] === "1"
+    )
+      context.skip();
     const dir = await mkdtemp("/tmp/scriptc-three-");
     const previousTarget = process.env["SCRIPTC_TARGET"];
     const previousCc = process.env["SCRIPTC_CC"];