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CVE-2026-55204

8.7 high SSVC exploitation: none Analyzed
NVD · CVE.org

HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpack_dht_insert() within src/hpack-tbl.c that fails to validate the return value of hpack_dht_defrag() when the memory pool is exhausted. An attacker can trigger HPACK dynamic table insertions under memory pressure to dereference a NULL pointer and crash HAProxy worker processes, causing denial of service.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.7 · haproxyNVD modified 2026-10-08 17:13

Affected (CPE criteria) 1

  • cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*

References 2