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CVE-2026-33555

MEDIUM

4.0

Descricao

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.

Detalhes CVE

Pontuacao CVSS v3.14.0

SeveridadeMEDIUM

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

Vetor de ataqueNETWORK

ComplexidadeHIGH

Privilegios necessariosNONE

Interacao do usuarioNONE

Publicado4/13/2026

Ultima modificacao4/17/2026

Fontenvd

Avistamentos honeypot0

Fraquezas (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)

Correlacoes IOC

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