Import Source
https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-90261.json
JSON Data
https://api.osv.dev/v1/vulns/AZL-90261
Upstream
Published
2026-06-18T17:16:34Z
Modified
2026-08-29T05:27:27Z
Summary
CVE-2026-55204 affecting package haproxy for versions less than 2.9.11-7
Details

HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpackdhtinsert() within src/hpack-tbl.c that fails to validate the return value of hpackdhtdefrag() 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.

References

Affected packages

Azure Linux:3 / haproxy

Package

Name
haproxy
Purl
pkg:rpm/azure-linux/haproxy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.11-7

Database specific

source
"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-90261.json"