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CVE-2026-55204 is a NULL pointer dereference vulnerability affecting HAProxy through version 3.4.0. The hpack_dht_insert() function 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, causing a NULL pointer dereference that crashes HAProxy worker processes and results in denial of service.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible, low-complexity vulnerability requiring no privileges or user interaction that can cause a high availability impact. The notice applies to CentOS 8.4 systems covered by the TuxCare CLSA-2026-1782825982 local security check.
An HAProxy vulnerability affecting TencentOS Server 3 that can be exploited remotely without privileges or user interaction and has an availability impact.
A network-reachable, low-complexity vulnerability requiring no privileges or user interaction that affects availability only, with high availability impact, in HAProxy packages on Huawei EulerOS 2.0.
A remotely exploitable, low-complexity availability-impact vulnerability affecting HAProxy packages on Huawei EulerOS 2.0. The supplied CVSS vectors indicate no privileges or user interaction are required and impact is limited to availability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.