CVEvulnerability
CVE-2026-55204
8.7 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-06-18
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 8.7 HIGH — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-476
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.
Affected configurations
• haproxy haproxy (< 2.4.36)
• haproxy haproxy (>= 2.5 < 2.6.30)
• haproxy haproxy (>= 2.7 < 2.8.25)
• haproxy haproxy (>= 2.9 < 3.0.24)
• haproxy haproxy (>= 3.1 < 3.2.20)
• haproxy haproxy (>= 3.3 < 3.4.1)
Related
Weakness · CWE (1)
- CWE-476 NULL Pointer Dereference weakness