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CRITICALCVE-2026-41248Published Modified CNA GitHub_M

CVE-2026-41248: Official Clerk JavaScript SDKs: Middleware-based route protection bypass

Clerk JavaScript is the official JavaScript repository for Clerk authentication. createRouteMatcher in @clerk/nextjs, @clerk/nuxt, and @clerk/astro can be bypassed by certain crafted requests, allowing them to skip middleware gating and reach downstream handlers. This vulnerability is fixed in @clerk/astro 1.5.7, 2.17.10, and 3.0.15; @clerk/nextjs 5.7.6, 6.39.2, and 7.2.1; @clerk/nuxt 1.13.28 and 2.2.2; and @clerk/shared 2.22.1, 3.47.4, anc 4.8.1

Metrics

CVSS v3.1
9.1
Severity
CRITICAL
Fixed in
—
Affected Products
4
Affected packages
  • clerk / astro
    >= 0.0.1, < 1.5.7 · >= 2.0.0-snapshot.v20241206174604, <= 2.17.9 · >= 3.0.0, < 3.0.15
  • clerk / nextjs
    >= 5.0.0, < 5.7.6 · >= 6.0.0-snapshot.vb87a27f, < 6.39.2 · >= 7.0.0, < 7.2.1
  • clerk / nuxt
    >= 1.1.0, < 1.13.28 · >= 2.0.0, < 2.2.2
  • clerk / shared
    >= 2.20.17, < 2.22.1 · >= 3.0.0-canary.v20250225091530, < 3.47.4 · >= 4.0.0, < 4.8.1
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References