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Debian haproxy Important HTTP Request Smuggling CVE-2026-33555 DSA-6291-1

debian
Calendar Grey May 22, 2026
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Learn about a critical HTTP request smuggling vulnerability in haproxy fixed for Debian trixie.
Martino Spagnuolo reported that the HTTP/3 parsing code in HAProxy, a fast and reliable load balancing reverse proxy, does not properly validate the received body size and the anno...
Topics%20covered

Topics Covered

security advisory debian important haproxy http request smuggling cve-2026-33555

Summary

For the stable distribution (trixie), this problem has been fixed in
version 3.0.11-1+deb13u3.

We recommend that you upgrade your haproxy packages.

For the detailed security status of haproxy please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/haproxy

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/



Severity
important
Lowest
Low
Medium
High
Critical

Package: haproxy
CVE ID: CVE-2026-33555

Topics%20covered

Topics Covered

security advisory debian important haproxy http request smuggling cve-2026-33555

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