Security Advisory

CVE-2026-33555

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-13 00:00:00

Last updated 2026-04-22 18:43:17

Assigner mitre

State PUBLISHED

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.

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