Riskcovery

CVE-2026-110354

State
Published
Severity
7.5 High
Published
Oct 22, 2026
Updated
Oct 22, 2026
Reserved
Oct 13, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hmitre

Weaknesses

  • CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Affected Products

ProductVersions
HAProxyHAProxy
  • 3.0.0 to before 3.0.30Affected
  • 3.2.0 to before 3.2.26Affected
  • 3.3.0 to before 3.3.17Affected
  • 3.4.0 to before 3.4.6Affected
  • 3.5-dev to before 3.5-dev9Affected
HAProxy Enterprise EditionHAProxy
  • 3.0r1 to before 3.0r1-362.1441Affected
  • 3.2r1 to before 3.2r1-378.1259Affected
  • 3.3r1 to before 3.3r1-377.1005Affected
HAProxy Kubernetes Ingress ControllerHAProxy Technologies
  • 3.2.0 to before 3.2.17Affected
Kubernetes Ingress Controller EnterpriseHAProxy Technologies
  • 3.2.0 to before 3.2.17-ee1Affected
  • 3.0 to before 3.0.16-ee17Affected
  • 1.11 to before 1.11.14-ee11Affected

References

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