RHSA-2026:55861: Important: haproxy security update
Important: haproxy security update
Other sources
The haproxy packages provide a reliable, high-performance network load balancer for TCP and HTTP-based applications.Security Fix(es): haproxy: HAProxy: Denial of Service via HPACK dynamic table insertions (CVE-2026-55204) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/haproxyto a version that resolves this vulnerability.Fixed in 1.8.27-2.el8_4.2 - Upgrade
Upgrade
redhat/haproxy-debuginfoto a version that resolves this vulnerability.Fixed in 1.8.27-2.el8_4.2 - Upgrade
Upgrade
redhat/haproxy-debugsourceto a version that resolves this vulnerability.Fixed in 1.8.27-2.el8_4.2
Event History
Frequently Asked Questions
What is the severity of RHSA-2026:55861?
The severity of RHSA-2026:55861 is high with a score of 7.
What vulnerability is addressed in RHSA-2026:55861?
RHSA-2026:55861 addresses a Denial of Service vulnerability via HPACK dynamic table insertions, identified as CVE-2026-55204.
How do I fix RHSA-2026:55861?
To fix RHSA-2026:55861, you need to apply the updated haproxy packages provided in the security update.
What software is affected by RHSA-2026:55861?
The affected software includes haproxy packages on Red Hat Enterprise Linux Server and related distributions.
When was RHSA-2026:55861 published?
RHSA-2026:55861 was published on August 17, 2026.