RHSA-2026:55772: Important: haproxy security update

Published Aug 17, 2026
·
Updated

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) haproxy: HAProxy: Response smuggling due to integer overflow in FastCGI record length handling (CVE-2026-55203) 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

28 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - 4 years of updates
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Red Hat Enterprise Linux for ARM 64
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for Power, little endian
Red Hat Red Hat Enterprise Linux for IBM z Systems
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for x86_64
Red Hat Red Hat Enterprise Linux for IBM z Systems - 4 years of updates
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
redhat/haproxy<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy-debuginfo<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy-debugsource<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy-debuginfo<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy-debugsource<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy-debuginfo<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy-debugsource<2.8.14-3.el9_8.2
2.8.14-3.el9_8.2
redhat/haproxy<2.8.14-3.el9_8.2.aa
2.8.14-3.el9_8.2.aa
redhat/haproxy-debuginfo<2.8.14-3.el9_8.2.aa
2.8.14-3.el9_8.2.aa
redhat/haproxy-debugsource<2.8.14-3.el9_8.2.aa
2.8.14-3.el9_8.2.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/haproxy to a version that resolves this vulnerability.

    Fixed in 2.8.14-3.el9_8.2
  2. Upgrade

    Upgrade redhat/haproxy-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.8.14-3.el9_8.2
  3. Upgrade

    Upgrade redhat/haproxy-debugsource to a version that resolves this vulnerability.

    Fixed in 2.8.14-3.el9_8.2
  4. Upgrade

    Upgrade redhat/haproxy to a version that resolves this vulnerability.

    Fixed in 2.8.14-3.el9_8.2.aa
  5. Upgrade

    Upgrade redhat/haproxy-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.8.14-3.el9_8.2.aa
  6. Upgrade

    Upgrade redhat/haproxy-debugsource to a version that resolves this vulnerability.

    Fixed in 2.8.14-3.el9_8.2.aa
  7. Upgrade

    Upgrade haproxy to a version that resolves this vulnerability.

    Patch CVE-2026-55203
  8. Upgrade

    Upgrade haproxy to a version that resolves this vulnerability.

    Patch CVE-2026-55204

Event History

Aug 17, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·03:14 PM
Data Sourced
via Red Hat·03:14 PM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:55772?

The severity of RHSA-2026:55772 is categorized as high with a score of 7.

2

How do I fix RHSA-2026:55772?

You can fix RHSA-2026:55772 by updating the haproxy packages to the latest versions provided by Red Hat.

3

What vulnerabilities are addressed in RHSA-2026:55772?

RHSA-2026:55772 addresses vulnerabilities such as denial of service via HPACK dynamic table insertions and response smuggling.

4

Who is affected by RHSA-2026:55772?

RHSA-2026:55772 affects users of various Red Hat Enterprise Linux versions running haproxy.

5

Is there a workaround for RHSA-2026:55772?

There are currently no official workarounds for RHSA-2026:55772; applying the security update is recommended.

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