UpHeron
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Servers and applications

CVE-2026-110354

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…

Severity
High 7.5
Published
22 Oct 2026
Last changed
22 Oct 2026
Added to UpHeron
3 Nov 2026
Fixed in
3.0.30, 3.2.26, 3.3.17, 3.4.6, 3.5-dev9
Sources
CVE Program

Affected software

SoftwareAffected versions
HAProxyServers and applications · cna:haproxy|haproxy
  • From 3.0.0 before 3.0.30
  • From 3.2.0 before 3.2.26
  • From 3.3.0 before 3.3.17
  • From 3.4.0 before 3.4.6
  • From 3.5-dev before 3.5-dev9

References

  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-110354