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.
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History
Thu, 18 Jun 2026 18:30:00 +0000
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ssvc
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Thu, 18 Jun 2026 16:45:00 +0000
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| 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. | |
| Title | HAProxy - NULL Pointer Dereference in hpack_dht_insert Function | |
| First Time appeared |
Haproxy
Haproxy aloha |
|
| Weaknesses | CWE-476 | |
| CPEs | cpe:2.3:a:haproxy:aloha:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Haproxy
Haproxy aloha |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-06-18T17:26:38.498Z
Reserved: 2026-06-16T15:53:37.765Z
Link: CVE-2026-55204
Updated: 2026-06-18T17:26:31.904Z
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OpenCVE Enrichment
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