Improper Handling of Length Parameter Inconsistency Affecting haproxy18 package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.3% (22nd percentile)

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  • Snyk IDSNYK-RHEL10-HAPROXY18-16065727
  • published15 Apr 2026
  • disclosed13 Apr 2026

Introduced: 13 Apr 2026

CVE-2026-33555  (opens in a new tab)
CWE-130  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 haproxy18.

NVD Description

Note: Versions mentioned in the description apply only to the upstream haproxy18 package and not the haproxy18 package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1