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CVE-2026-110354

7.5 high SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 7

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-22 02:46
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 19:17
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-22 02:46
  4. StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 17:36
  5. StatusReceived → PublishedNVD modified 2026-10-22 02:46
  6. StatusPublished → ReceivedNVD modified 2026-10-22 03:16
  7. First seenCVSS 7.5 · haproxy, haproxy technologiesNVD modified 2026-10-22 02:46

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1