CVE-2026-110354

No fix known EPSS <1%CVSS 7.5

HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.

Published 2026-10-22 · CVE record · OSV

Products: haproxy, HAProxy Enterprise Edition, HAProxy Technologies HAProxy Kubernetes Ingress Controller, HAProxy Technologies Kubernetes Ingress Controller Enterprise

Distro releases