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CVE-2026-44575

CVE-2026-44575 · Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes

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Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5.

CVSS 7.5 · Élevée · EPSS 0,8% · Correctif disponible

Publication
Mise à jour

Pile logicielle: node

Produits et versions concernés

  • next.js

    Versions du logiciel
    • >= 16.0.0, < 16.2.5: Concernée
    • >= 15.2.0, < 15.5.16: Concernée

    Aucun correctif publié

  • next npm

    Plages de versions concernées
    • SEMVER: ≥ 15.2.0, < 15.5.16

    Mettez à jour vers 15.5.16

  • next npm

    Plages de versions concernées
    • SEMVER: ≥ 16.0.0, < 16.2.5

    Mettez à jour vers 16.2.5

Sources originales

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