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CVE-2026-33805

CVE-2026-33805 · @fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers

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@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from. Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.

CVSS 9.0 · Critique · EPSS 0,4% · Correctif disponible

Publication
Mise à jour

Pile logicielle: node

Produits et versions concernés

  • @fastify/reply-from

    Versions du logiciel
    • ≥ 0, < 12.6.2: Concernée (semver)
    • 12.6.2: Non concernée (semver)

    Mettez à jour vers 12.6.2

  • @fastify/http-proxy

    Versions du logiciel
    • ≥ 0, < 11.4.4: Concernée (semver)
    • 11.4.4: Non concernée (semver)

    Mettez à jour vers 11.4.4

  • @fastify/reply-from npm

    Plages de versions concernées
    • SEMVER: < 12.6.2

    Mettez à jour vers 12.6.2

  • @fastify/http-proxy npm

    Plages de versions concernées
    • SEMVER: < 11.4.4

    Mettez à jour vers 11.4.4

Sources originales

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