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CVE-2026-45109

CVE-2026-45109 · Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes

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

Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.

CVSS 7.5 · High · EPSS 0.8% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • next.js

    Versions
    • >= 15.2.0, < 15.5.17: Affected
    • >= 16.0.0, < 16.2.6: Affected

    No fix published

  • next npm

    Affected ranges
    • SEMVER: ≥ 15.2.0, < 15.5.18

    Update to 15.5.18

  • next npm

    Affected ranges
    • SEMVER: ≥ 16.0.0, < 16.2.6

    Update to 16.2.6

Original sources

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