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CVE-2026-33555

MEDIUM

4.0

Descripcion

An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received body length matches a previously announced content-length when the stream is closed via a frame with an empty payload. This can cause desynchronization issues with the backend server and could be used for request smuggling. The earliest affected version is 2.6.

Detalles CVE

Puntuacion CVSS v3.14.0

SeveridadMEDIUM

Vector CVSSCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

Vector de ataqueNETWORK

ComplejidadHIGH

Privilegios requeridosNONE

Interaccion usuarioNONE

Publicado4/13/2026

Ultima modificacion4/17/2026

Fuentenvd

Avistamientos honeypot0

Debilidades (CWE)

CWE-130

Referencias

https://github.com/haproxy/haproxy/commit/05a295441c621089ffa4318daf0dbca2dd756a84(cve@mitre.org)

https://www.haproxy.com/documentation/haproxy-aloha/changelog/(cve@mitre.org)

https://www.haproxy.org(cve@mitre.org)

https://www.mail-archive.com/haproxy@formilux.org/msg46752.html(cve@mitre.org)

Correlaciones IOC

Sin correlaciones registradas

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