high7.5
CVE-2026-55204
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 va…
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Haproxy | Haproxy | before 2.4.36 from 2.5 before 2.6.30 from 2.7 before 2.8.25 from 2.9 before 3.0.24 from 3.1 before 3.2.20 from 3.3 before 3.4.1 |