diff --git a/src/advisory/osv-sync.ts b/src/advisory/osv-sync.ts
index 4d736f5e..0788c48a 100644
--- a/src/advisory/osv-sync.ts
+++ b/src/advisory/osv-sync.ts
@@ -324,11 +324,33 @@ export async function syncOsvAdvisories(
   let replacementWarning: string | undefined;
   let syncResult: SyncOsvAdvisoriesResult | undefined;
   const startupWarnings: string[] = [];
+  let onSigint: (() => void) | undefined;
+  let onSigterm: (() => void) | undefined;
 
   try {
     fs.mkdirSync(path.dirname(dbPath), { recursive: true });
     startupWarnings.push(...cleanupAbandonedStagingDirectories(dbPath));
     tempDir = fs.mkdtempSync(stagingDirectoryPrefix(dbPath));
+    const stagingDirToClean = tempDir;
+    const cleanupStagingOnSignal = (signal: NodeJS.Signals) => {
+      try {
+        fs.rmSync(stagingDirToClean, { recursive: true, force: true });
+      } catch {
+        // best-effort cleanup on abort
+      }
+      if (onSigint) process.removeListener("SIGINT", onSigint);
+      if (onSigterm) process.removeListener("SIGTERM", onSigterm);
+      if (process.platform === "win32") {
+        process.exit(signal === "SIGINT" ? 130 : 143);
+      } else {
+        process.kill(process.pid, signal);
+      }
+    };
+    onSigint = () => cleanupStagingOnSignal("SIGINT");
+    onSigterm = () => cleanupStagingOnSignal("SIGTERM");
+    process.once("SIGINT", onSigint);
+    process.once("SIGTERM", onSigterm);
+
     recordStagingOwner(tempDir, dbPath);
     const tempDbPath = path.join(tempDir, path.basename(dbPath));
     const zippedBytes = await downloadAdvisoryArchive(sourceUrl, dbPath, options.fetchImpl ?? fetch, onProgress);
@@ -345,6 +367,8 @@ export async function syncOsvAdvisories(
   } catch (error) {
     refreshError = error;
   } finally {
+    if (onSigint) process.removeListener("SIGINT", onSigint);
+    if (onSigterm) process.removeListener("SIGTERM", onSigterm);
     if (tempDir !== undefined) cleanupWarning = cleanupTempDirectory(tempDir);
   }
 
diff --git a/tests/osv-sync.test.ts b/tests/osv-sync.test.ts
index 3640ad77..5169eb65 100644
--- a/tests/osv-sync.test.ts
+++ b/tests/osv-sync.test.ts
@@ -721,4 +721,59 @@ describe("syncOsvAdvisories", () => {
       expect(advisoryPath).toBe(path.join(os.homedir(), ".cache", "cve-lite", "advisories.db"));
     }
   });
+
+  it("removes SIGINT and SIGTERM listeners after sync completes or throws", async () => {
+    const tempDir = createTempDir();
+    const dbPath = path.join(tempDir, "advisories.db");
+    const sigintBefore = process.listenerCount("SIGINT");
+    const sigtermBefore = process.listenerCount("SIGTERM");
+
+    try {
+      await syncOsvAdvisories({
+        outputPath: dbPath,
+        fetchImpl: async () => {
+          throw new Error("aborted");
+        },
+      }).catch(() => {});
+
+      expect(process.listenerCount("SIGINT")).toBe(sigintBefore);
+      expect(process.listenerCount("SIGTERM")).toBe(sigtermBefore);
+    } finally {
+      removeDir(tempDir);
+    }
+  });
+
+  it("cleans up temporary staging directory if SIGINT is received during sync", async () => {
+    const tempDir = createTempDir();
+    const dbPath = path.join(tempDir, "advisories.db");
+    let capturedTempDir: string | undefined;
+    const killSpy = jest.spyOn(process, "kill").mockImplementation((() => true) as any);
+    const exitSpy = jest.spyOn(process, "exit").mockImplementation((() => {}) as any);
+
+    try {
+      const syncPromise = syncOsvAdvisories({
+        outputPath: dbPath,
+        fetchImpl: async () => {
+          const entries = fs.readdirSync(tempDir);
+          const staging = entries.find((e) => e.includes(".advisories.db.tmp-"));
+          if (staging) {
+            capturedTempDir = path.join(tempDir, staging);
+            expect(fs.existsSync(capturedTempDir)).toBe(true);
+            process.emit("SIGINT");
+          }
+          throw new Error("aborted");
+        },
+      });
+
+      await syncPromise.catch(() => {});
+
+      if (capturedTempDir) {
+        expect(fs.existsSync(capturedTempDir)).toBe(false);
+      }
+    } finally {
+      killSpy.mockRestore();
+      exitSpy.mockRestore();
+      removeDir(tempDir);
+    }
+  });
 });