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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-41248

Official Clerk JavaScript SDKs: Middleware-based route protection bypass

Description

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

clerk astro

  • >= 0.0.1, < 1.5.7affected
  • >= 2.0.0-snapshot.v20241206174604, <= 2.17.9affected
  • >= 3.0.0, < 3.0.15affected

clerk nextjs

  • >= 5.0.0, < 5.7.6affected
  • >= 6.0.0-snapshot.vb87a27f, < 6.39.2affected
  • >= 7.0.0, < 7.2.1affected

clerk nuxt

  • >= 1.1.0, < 1.13.28affected
  • >= 2.0.0, < 2.2.2affected

clerk shared

  • >= 2.20.17, < 2.22.1affected
  • >= 3.0.0-canary.v20250225091530, < 3.47.4affected
  • >= 4.0.0, < 4.8.1affected

References