CVEvulnerability

CVE-2026-110354

7.5 HIGH Published 2026-10-22 Modified 2026-10-22 Official page ↗
Status
Awaiting Analysis
Published
2026-10-22
Last modified
2026-10-22
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-835

Description

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.

Related

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References