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CVE-2026-42349
Vulnerability in @clerk/shared (CVE-2026-42349)
Summary
vulnerability in @clerk/shared (CVE-2026-42349). Risk of unauthorized operations or information disclosure. Exploitable via ``clerkMiddleware``. Mitigation: upgrade to `4.8.3` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-42349** has been found in @clerk/shared.
Attackers can target a specific entry point like ``clerkMiddleware`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade @clerk/shared to **4.8.3** or later.
If unsure, ask your IT team or search "@clerk/shared CVE-2026-42349" on the vendor's site.
CVE-2026-42349 (@clerk/shared) — CWE-754 /
Attack surface: `clerkMiddleware` / `reverification` / `role` / `permission`
Patched: `4.8.3` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-754) exists in @clerk/shared. Attackers reach the vulnerable code path via ``clerkMiddleware`` without authentication.
📍 Affected scope
@clerk/shared — . Attack surface: `clerkMiddleware` / `reverification` / `role` / `permission`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **4.8.3**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r '@clerk/shared' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r '@clerk/shared' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `@clerk/shared` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade @clerk/shared to 4.8.3ステージング環境で 4.8.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
-
7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
npm
@clerk/shared
[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.8.3"}]}]
npm
@clerk/backend
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.2.14"}]}]
npm
@clerk/nextjs
[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"7.2.4"}]}]
npm
@clerk/clerk-js
[{"type":"SEMVER","events":[{"introduced":"6.0.0"},{"fixed":"6.7.5"}]}]
npm
@clerk/clerk-react
[{"type":"SEMVER","events":[{"introduced":"5.9.0"},{"fixed":"5.61.6"}]}]
npm
@clerk/react
[{"type":"SEMVER","events":[{"introduced":"6.0.0"},{"fixed":"6.4.3"}]}]
npm
@clerk/vue
[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.0.16"}]}]
npm
@clerk/astro
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.0.18"}]}]
npm
@clerk/nuxt
[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.2.5"}]}]
npm
@clerk/clerk-expo
[{"type":"SEMVER","events":[{"introduced":"2.2.11"},{"fixed":"2.19.36"}]}]
npm
@clerk/expo
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.2.2"}]}]
npm
@clerk/react-router
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.1.4"}]}]
npm
@clerk/tanstack-react-start
[{"type":"SEMVER","events":[{"introduced":"1.0.0"},{"fixed":"1.1.4"}]}]
npm
@clerk/chrome-extension
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.1.15"}]}]
npm
@clerk/fastify
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"3.1.16"}]}]
npm
@clerk/express
[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.1.6"}]}]
npm
@clerk/hono
[{"type":"SEMVER","events":[{"introduced":"0.0.2"},{"fixed":"0.1.16"}]}]