diff --git a/actions/dependency-cooldown/dist/index.mjs b/actions/dependency-cooldown/dist/index.mjs
index 6af93f3..148e0d4 100644
--- a/actions/dependency-cooldown/dist/index.mjs
+++ b/actions/dependency-cooldown/dist/index.mjs
@@ -11235,8 +11235,19 @@ var NON_REGISTRY_PROTOCOLS = [
   "git+",
   "github:",
   "http:",
-  "https:"
+  "https:",
+  "root:"
 ];
+var LOCAL_TARBALL_EXTENSIONS = [".tgz", ".tar.gz", ".tar"];
+function isLocalTarballSpecifier(specifier) {
+  if (specifier.startsWith("./") || specifier.startsWith("../") || specifier.startsWith("/")) {
+    return true;
+  }
+  return LOCAL_TARBALL_EXTENSIONS.some((extension) => specifier.endsWith(extension));
+}
+function isNpmRegistryTuple(entry) {
+  return typeof entry[1] === "string";
+}
 function splitDescriptor(descriptor) {
   const separator = descriptor.indexOf("@", 1);
   if (separator <= 0) {
@@ -11283,6 +11294,10 @@ var bunLockfile = {
         uncheckable.push({ name, version: null, reason: `resolved via ${protocol}` });
         continue;
       }
+      if (!isNpmRegistryTuple(entry) && isLocalTarballSpecifier(specifier)) {
+        uncheckable.push({ name, version: null, reason: "resolved via local tarball" });
+        continue;
+      }
       refs.push({ registry: "npm", name, version: specifier });
     }
     return { refs, uncheckable };
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..9ef88e5
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "shared-workflows",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}
diff --git a/packages/dependency-cooldown/src/lockfiles/bun.ts b/packages/dependency-cooldown/src/lockfiles/bun.ts
index 0c00435..401599d 100644
--- a/packages/dependency-cooldown/src/lockfiles/bun.ts
+++ b/packages/dependency-cooldown/src/lockfiles/bun.ts
@@ -7,6 +7,14 @@ import type { DependencyRef, LockfileFormat, ParsedLockfile } from "../types.js"
  * `"<key>": ["<name>@<version>", registry, meta, integrity]`. Non-registry
  * dependencies use a descriptor such as `name@workspace:path` or
  * `name@git+https://...` instead of a semver version.
+ *
+ * Local tarballs are a separate resolution type: Bun writes `name@./file.tgz`
+ * with no `file:` prefix (folders use `file:`, remote tarball URLs use
+ * `http:`/`https:`). Distinguishing them from registry versions must use the
+ * tuple, not the specifier suffix: npm prereleases such as `1.2.3-release.tgz`
+ * are valid, and Bun still stores them as `[name@version, registry, meta,
+ * integrity]` with a string registry field. Local tarballs put the metadata
+ * object in that slot: `[name@tarball, meta]`.
  */
 const NON_REGISTRY_PROTOCOLS = [
   "workspace:",
@@ -16,8 +24,23 @@ const NON_REGISTRY_PROTOCOLS = [
   "github:",
   "http:",
   "https:",
+  "root:",
 ];
 
+const LOCAL_TARBALL_EXTENSIONS = [".tgz", ".tar.gz", ".tar"];
+
+function isLocalTarballSpecifier(specifier: string): boolean {
+  if (specifier.startsWith("./") || specifier.startsWith("../") || specifier.startsWith("/")) {
+    return true;
+  }
+  return LOCAL_TARBALL_EXTENSIONS.some((extension) => specifier.endsWith(extension));
+}
+
+/** npm resolutions store a registry URL (or `""` for the default) at index 1. */
+function isNpmRegistryTuple(entry: unknown[]): boolean {
+  return typeof entry[1] === "string";
+}
+
 function splitDescriptor(descriptor: string): { name: string; specifier: string } {
   // The separator is the first @ after index 0: a scoped name starts with @,
   // and a git specifier may itself contain one (git+ssh://git@host/...).
@@ -73,6 +96,10 @@ export const bunLockfile: LockfileFormat = {
         uncheckable.push({ name, version: null, reason: `resolved via ${protocol}` });
         continue;
       }
+      if (!isNpmRegistryTuple(entry) && isLocalTarballSpecifier(specifier)) {
+        uncheckable.push({ name, version: null, reason: "resolved via local tarball" });
+        continue;
+      }
       refs.push({ registry: "npm", name, version: specifier });
     }
 
diff --git a/packages/dependency-cooldown/test/end-to-end.test.ts b/packages/dependency-cooldown/test/end-to-end.test.ts
index 341c611..e14e59f 100644
--- a/packages/dependency-cooldown/test/end-to-end.test.ts
+++ b/packages/dependency-cooldown/test/end-to-end.test.ts
@@ -386,4 +386,34 @@ describe("audit mode", () => {
 
     expect(code).toBe(0);
   });
+
+  it("audits a bun.lock that pins a local tarball without querying the registry for it", async () => {
+    write(
+      "bun.lock",
+      `{
+        "lockfileVersion": 1,
+        "packages": {
+          "left-pad": ["left-pad@1.3.0", "", {}, "sha512-bbbb"],
+          "human-readable-checksum": ["human-readable-checksum@./package/human-readable-checksum-0.3.0.tgz", {}]
+        }
+      }`,
+    );
+    commit("base");
+
+    const inner = httpStub({});
+    const http: HttpClient = {
+      async getJson(url) {
+        if (url === "https://registry.npmjs.org/human-readable-checksum") {
+          throw new Error(`GET ${url} failed with HTTP 404 Not Found`);
+        }
+        return inner.getJson(url);
+      },
+    };
+
+    const code = await run(["--mode=audit", `--repo-dir=${repoDir}`], { http, now: NOW });
+
+    expect(code).toBe(0);
+    expect(summary()).toContain("human-readable-checksum");
+    expect(summary()).toContain("could not be age-checked");
+  });
 });
diff --git a/packages/dependency-cooldown/test/lockfiles.test.ts b/packages/dependency-cooldown/test/lockfiles.test.ts
index be97684..95791fe 100644
--- a/packages/dependency-cooldown/test/lockfiles.test.ts
+++ b/packages/dependency-cooldown/test/lockfiles.test.ts
@@ -44,6 +44,32 @@ describe("npm package-lock.json", () => {
       ),
     ).toThrow(/lockfileVersion 1/);
   });
+
+  it("reports a local tarball as uncheckable rather than treating it as a registry version", () => {
+    const parsed = npmLockfile.parse(
+      JSON.stringify({
+        lockfileVersion: 3,
+        packages: {
+          "": { name: "demo-app", version: "1.0.0" },
+          "node_modules/human-readable-checksum": {
+            version: "0.3.0",
+            resolved: "file:package/human-readable-checksum-0.3.0.tgz",
+          },
+        },
+      }),
+      "package-lock.json",
+    );
+
+    expect(parsed.refs).toEqual([]);
+    expect(parsed.uncheckable).toEqual([
+      {
+        name: "human-readable-checksum",
+        version: "0.3.0",
+        reason:
+          "not resolved from registry.npmjs.org (file:package/human-readable-checksum-0.3.0.tgz)",
+      },
+    ]);
+  });
 });
 
 describe("bun.lock", () => {
@@ -90,6 +116,67 @@ describe("bun.lock", () => {
       "workspace-lib",
     ]);
   });
+
+  it.each(["1.2.3-release.tgz", "1.0.0-beta.tar.gz", "2.0.0-rc.tar"])(
+    "collects registry semver %s even though it ends with a tarball extension",
+    (version) => {
+      const parsed = bunLockfile.parse(
+        `{ "packages": { "pkg": ["pkg@${version}", "", {}, "sha512-abcd"] } }`,
+        "bun.lock",
+      );
+
+      expect(parsed.uncheckable).toEqual([]);
+      expect(parsed.refs).toEqual([{ registry: "npm", name: "pkg", version }]);
+    },
+  );
+
+  it("reports a relative local tarball as uncheckable rather than treating it as a registry version", () => {
+    const parsed = bunLockfile.parse(
+      '{ "packages": { "human-readable-checksum": ["human-readable-checksum@./package/human-readable-checksum-0.3.0.tgz", {}] } }',
+      "bun.lock",
+    );
+
+    expect(parsed.refs).toEqual([]);
+    expect(parsed.uncheckable).toEqual([
+      {
+        name: "human-readable-checksum",
+        version: null,
+        reason: "resolved via local tarball",
+      },
+    ]);
+  });
+
+  it.each([
+    "../vendor/pkg-1.0.0.tgz",
+    "/opt/pkg-1.0.0.tgz",
+    "package/pkg-1.0.0.tgz",
+    "./1.2.3-release.tgz",
+  ])(
+    "reports local tarball specifier %s as uncheckable",
+    (specifier) => {
+      const parsed = bunLockfile.parse(
+        `{ "packages": { "pkg": ["pkg@${specifier}", {}] } }`,
+        "bun.lock",
+      );
+
+      expect(parsed.refs).toEqual([]);
+      expect(parsed.uncheckable).toEqual([
+        { name: "pkg", version: null, reason: "resolved via local tarball" },
+      ]);
+    },
+  );
+
+  it("reports the lockfile root entry as uncheckable", () => {
+    const parsed = bunLockfile.parse(
+      '{ "packages": { "demo-app": ["demo-app@root:", { "bin": { "demo": "bin.js" } }] } }',
+      "bun.lock",
+    );
+
+    expect(parsed.refs).toEqual([]);
+    expect(parsed.uncheckable).toEqual([
+      { name: "demo-app", version: null, reason: "resolved via root:" },
+    ]);
+  });
 });
 
 describe("pubspec.lock", () => {