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Critical · 9.1 CVE-2026-41248 EUVD-2026-25632GHSA-vqx2-fgx2-5wq9

Official Clerk JavaScript SDKs: Middleware-based route protection bypass

Published Apr 24, 2026 · Updated Apr 27, 2026 · Assigned by GitHub_M

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

VendorProductAffectedFixed
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 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @clerk/astro >= 0.0.1, < 1.5.7 1.5.7 GHSA-vqx2-fgx2-5wq9
npm @clerk/astro >= 2.0.0-snapshot.v20241206174604, < 2.17.10 2.17.10 GHSA-vqx2-fgx2-5wq9
npm @clerk/astro >= 3.0.0, < 3.0.15 3.0.15 GHSA-vqx2-fgx2-5wq9
npm @clerk/nextjs >= 5.0.0, < 5.7.6 5.7.6 GHSA-vqx2-fgx2-5wq9
npm @clerk/nextjs >= 6.0.0-snapshot.vb87a27f, < 6.39.2 6.39.2 GHSA-vqx2-fgx2-5wq9
npm @clerk/nextjs >= 7.0.0, < 7.2.1 7.2.1 GHSA-vqx2-fgx2-5wq9
npm @clerk/nuxt >= 1.1.0, < 1.13.28 1.13.28 GHSA-vqx2-fgx2-5wq9
npm @clerk/nuxt >= 2.0.0, < 2.2.2 2.2.2 GHSA-vqx2-fgx2-5wq9
npm @clerk/shared >= 2.20.17, < 2.22.1 2.22.1 GHSA-vqx2-fgx2-5wq9
npm @clerk/shared >= 3.0.0-canary.v20250225091530, < 3.47.4 3.47.4 GHSA-vqx2-fgx2-5wq9
npm @clerk/shared >= 4.0.0, < 4.8.1 4.8.1 GHSA-vqx2-fgx2-5wq9

References