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HAProxy 3.4.0

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medium advisory

CVE-2026-55204: HAProxy Null Pointer Dereference Leads to Denial of Service

An unauthenticated attacker can exploit CVE-2026-55204, a null pointer dereference vulnerability in HAProxy through version 3.4.0, by triggering excessive HPACK dynamic table insertions under memory pressure, causing HAProxy worker processes to crash and resulting in a denial of service.

HAProxy 3.4.0 denial-of-service vulnerability HAProxy CVE-2026-55204
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