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CVE-2026-41248

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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

CVSS 9.1 · Critical · EPSS 0.3% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • astro

    Versions
    • >= 0.0.1, < 1.5.7: Affected
    • >= 2.0.0-snapshot.v20241206174604, <= 2.17.9: Affected
    • >= 3.0.0, < 3.0.15: Affected

    No fix published

  • nextjs

    Versions
    • >= 5.0.0, < 5.7.6: Affected
    • >= 6.0.0-snapshot.vb87a27f, < 6.39.2: Affected
    • >= 7.0.0, < 7.2.1: Affected

    No fix published

  • nuxt

    Versions
    • >= 1.1.0, < 1.13.28: Affected
    • >= 2.0.0, < 2.2.2: Affected

    No fix published

  • shared

    Versions
    • >= 2.20.17, < 2.22.1: Affected
    • >= 3.0.0-canary.v20250225091530, < 3.47.4: Affected
    • >= 4.0.0, < 4.8.1: Affected

    No fix published

  • @clerk/nextjs npm

    Affected ranges
    • SEMVER: ≥ 5.0.0, < 5.7.6

    Update to 5.7.6

  • @clerk/nuxt npm

    Affected ranges
    • SEMVER: ≥ 1.1.0, < 1.13.28

    Update to 1.13.28

  • @clerk/astro npm

    Affected ranges
    • SEMVER: ≥ 0.0.1, < 1.5.7

    Update to 1.5.7

  • @clerk/shared npm

    Affected ranges
    • SEMVER: ≥ 2.20.17, < 2.22.1

    Update to 2.22.1

  • @clerk/nextjs npm

    Affected ranges
    • SEMVER: ≥ 6.0.0-snapshot.vb87a27f, < 6.39.2

    Update to 6.39.2

  • @clerk/nextjs npm

    Affected ranges
    • SEMVER: ≥ 7.0.0, < 7.2.1

    Update to 7.2.1

  • @clerk/nuxt npm

    Affected ranges
    • SEMVER: ≥ 2.0.0, < 2.2.2

    Update to 2.2.2

  • @clerk/astro npm

    Affected ranges
    • SEMVER: ≥ 2.0.0-snapshot.v20241206174604, < 2.17.10

    Update to 2.17.10

  • @clerk/astro npm

    Affected ranges
    • SEMVER: ≥ 3.0.0, < 3.0.15

    Update to 3.0.15

  • @clerk/shared npm

    Affected ranges
    • SEMVER: ≥ 3.0.0-canary.v20250225091530, < 3.47.4

    Update to 3.47.4

  • @clerk/shared npm

    Affected ranges
    • SEMVER: ≥ 4.0.0, < 4.8.1

    Update to 4.8.1

Original sources

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