CVE-2026-55204
High · 7.5CVSS
7.5
EPSS
0.5%
Published
Jun 18, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | haproxy | 0 | 3.4.0+git31.fc300e9f2-1.1 |
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