{"@context":"https://openvex.dev/ns/v0.2.0","@id":"https://database.harborguard.co/cve/CVE-2026-55204/vex.json","author":"HarborGuard Database","role":"Document Creator","timestamp":"2026-06-18T17:26:38.498Z","version":1,"tooling":"HarborGuard Database (https://database.harborguard.co)","statements":[{"vulnerability":{"name":"CVE-2026-55204","@id":"https://www.cve.org/CVERecord?id=CVE-2026-55204","description":"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."},"products":[{"@id":"cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*","identifiers":{"cpe23":"cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*"}}],"status":"affected","action_statement":"Update to a fixed version: 9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513.","timestamp":"2026-06-18T17:26:38.498Z"}]}