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CVE Watch22 oct 2026

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 a

CVSS

7.5

Alto

EPSS

—

KEV

—

Exploit Today

—

0-100

Publicado: 22 oct 2026 · Última mod.: 22 oct 2026 · CWE-835

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

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.

Referencias oficiales

git.haproxy.orghttps://git.haproxy.org/?p=haproxy.git;a=commit;h=077906da140a35873bf451d7e9f67646c9f37c81

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