VULNERABILITY INTELLIGENCE

CVE-2026-33555

CVSS score4 MEDIUM
EPSS probability0.31%
CISA KEVNot currently listed
Published2026-04-13
Last modified2026-10-18
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

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.

Weakness classification

  • cve@mitre.org: CWE-130

Primary references