CVE-2026-33805criticalCWE-444CWE-644

CVE-2026-33805: falha crítica em @fastify/reply-from

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

Publicada em · Atualizada em

Seguir esta CVE+ Monitorar @fastify/reply-from+ Monitorar @fastify/http-proxy

Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.

28Vexday Risk Score

Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.

ssvc Trackcvss 9epss 0.4%
@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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N
Produtos afetados
@fastify/reply-from · @fastify/http-proxy@fastify/reply-from · @fastify/reply-from
CVEs relacionadas — @fastify/reply-from

No mesmo produto, das mais perigosas para as menos.

CVE-2026-117518HIGH@fastify/reply-from vulnerable to path traversal via backslash dot-segment prefix escapeEPSS 0.5%CVE-2026-16158HIGH@fastify/reply-from vulnerable to cross-upstream request routing via URL cache key collisionEPSS 0.4%CVE-2026-107318HIGH@fastify/reply-from vulnerable to improper certificate validation in built-in HTTPS transportsEPSS 0.1%