Medium4.0Red Hat & Ubuntu Linux

Request smuggling via HTTP/3 parser desynchronization

CVE-2026-33555 Published Apr 13, 2026

CVE-2026-33555

Affected products & platforms

Red Hat & Ubuntu LinuxUnclassified

Summary

Request smuggling via HTTP/3 parser desynchronization. Red Hat rates this moderate (CVSS 4). Weakness: CWE-130. Affected package(s): haproxy-main. Resolved in Red Hat advisory RHSA-2026:8749 — update the affected packages (`sudo dnf update`).

Affected versions

haproxy-main-3.0.19-1.1.hum1

Official advisory · high-confidence parse· fetched 6 hours ago·verify at source

Fixed versions

RHSA-2026:8749

Official advisory · high-confidence parse· fetched 6 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:8749 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 6 hours ago·verify at source

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.