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CVE-2026-33555

MEDIUM

4.0

Description

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.

Details CVE

Score CVSS v3.14.0

SeveriteMEDIUM

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

Vecteur d'attaqueNETWORK

ComplexiteHIGH

Privileges requisNONE

Interaction utilisateurNONE

Publie4/13/2026

Derniere modification4/17/2026

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-130

References

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)

Correlations IOC

Aucune correlation enregistree

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