diff --git a/packages/loopover-miner/lib/attempt-cli.ts b/packages/loopover-miner/lib/attempt-cli.ts
index 6dc4335ec..6c173bacc 100644
--- a/packages/loopover-miner/lib/attempt-cli.ts
+++ b/packages/loopover-miner/lib/attempt-cli.ts
@@ -1073,11 +1073,14 @@ export async function runAttempt(args: string[], options: RunAttemptOptions = {}
     }
     options.onResult?.(finalResult as AttemptCliResult);
 
+    // Terminal attempt outcome exit codes: submitted=0, abandon=7, stale=8, blocked=9, governed=10, verification_failed=12.
     switch (result.outcome) {
       case "submitted":
         return 0;
       case "abandon":
         return 7;
+      case "verification_failed":
+        return 12;
       case "stale":
         return 8;
       case "blocked":
diff --git a/packages/loopover-miner/lib/attempt-runner.ts b/packages/loopover-miner/lib/attempt-runner.ts
index 76bec8231..c58d56593 100644
--- a/packages/loopover-miner/lib/attempt-runner.ts
+++ b/packages/loopover-miner/lib/attempt-runner.ts
@@ -29,8 +29,9 @@ import type {
 import { prepareOpenPrSubmission } from "./harness-submission-trigger.js";
 import { captureMinerError } from "./sentry.js";
 
-export const ATTEMPT_OUTCOMES: readonly ["abandon", "stale", "blocked", "governed", "submitted"] = Object.freeze([
+export const ATTEMPT_OUTCOMES: readonly ["abandon", "verification_failed", "stale", "blocked", "governed", "submitted"] = Object.freeze([
   "abandon",
+  "verification_failed",
   "stale",
   "blocked",
   "governed",
diff --git a/test/unit/miner-attempt-cli.test.ts b/test/unit/miner-attempt-cli.test.ts
index f1b9d5975..38520fc42 100644
--- a/test/unit/miner-attempt-cli.test.ts
+++ b/test/unit/miner-attempt-cli.test.ts
@@ -1586,6 +1586,26 @@ describe("runAttempt (#5132)", () => {
     expect(String(error.mock.calls[0]?.[0])).toContain("target_not_found");
   });
 
+  it("REGRESSION (#10337): verification_failed has the dedicated exit code 12", async () => {
+    const { allocator, claimLedger, eventLedger, attemptLog, governorLedger } = tempLedgers();
+    vi.spyOn(console, "log").mockImplementation(() => undefined);
+
+    const exitCode = await runAttempt(["acme/widgets", "7", "--miner-login", "alice", "--json"], {
+      env: { MINER_CODING_AGENT_PROVIDER: "noop" },
+      openWorktreeAllocator: () => allocator,
+      openClaimLedger: () => claimLedger,
+      initEventLedger: () => eventLedger,
+      initAttemptLog: () => attemptLog,
+      initGovernorLedger: () => governorLedger,
+      ...readyPipelineOptions({
+        runMinerAttempt: async () =>
+          ({ outcome: "verification_failed", verification: { status: "failed" }, loopResult: fakeLoopResult() }) as never,
+      }),
+    });
+
+    expect(exitCode).toBe(12);
+  });
+
   it("REGRESSION: an unexpected runMinerAttempt outcome falls through to exit 2", async () => {
     const { allocator, claimLedger, eventLedger, attemptLog, governorLedger } = tempLedgers();
     vi.spyOn(console, "log").mockImplementation(() => undefined);