RHSA-2026:55679: 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 Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Update Support
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
Red Hat Red Hat Enterprise Linux for x86_64
Red Hat Red Hat Enterprise Linux for ARM 64 - 4 years of updates
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64 - 4 years of updates
Red Hat Red Hat Enterprise Linux for IBM z Systems
Red Hat Red Hat Enterprise Linux for Power, little endian
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for Power, little endian - 4 years of support
Red Hat Red Hat Enterprise Linux for ARM 64
redhat/haproxy<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy-debuginfo<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy-debugsource<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy-debuginfo<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy-debugsource<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy-debuginfo<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy-debugsource<3.0.5-6.el10_2.2
3.0.5-6.el10_2.2
redhat/haproxy<3.0.5-6.el10_2.2.aa
3.0.5-6.el10_2.2.aa
redhat/haproxy-debuginfo<3.0.5-6.el10_2.2.aa
3.0.5-6.el10_2.2.aa
redhat/haproxy-debugsource<3.0.5-6.el10_2.2.aa
3.0.5-6.el10_2.2.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 3.0.5-6.el10_2.2
  2. Upgrade

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

    Fixed in 3.0.5-6.el10_2.2
  3. Upgrade

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

    Fixed in 3.0.5-6.el10_2.2
  4. Upgrade

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

    Fixed in 3.0.5-6.el10_2.2.aa
  5. Upgrade

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

    Fixed in 3.0.5-6.el10_2.2.aa
  6. Upgrade

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

    Fixed in 3.0.5-6.el10_2.2.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·02:04 PM
Data Sourced
via Red Hat·02:04 PM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:55679?

The severity of RHSA-2026:55679 is high, rated at 7.

2

How do I fix RHSA-2026:55679?

To fix RHSA-2026:55679, update the haproxy packages to the latest version provided by Red Hat.

3

What vulnerabilities are addressed in RHSA-2026:55679?

RHSA-2026:55679 addresses a Denial of Service vulnerability via HPACK dynamic table insertions identified as CVE-2026-55204.

4

What software is affected by RHSA-2026:55679?

The affected software includes various versions of haproxy for Red Hat Enterprise Linux on different architectures.

5

What type of attack can RHSA-2026:55679 help mitigate?

RHSA-2026:55679 helps mitigate Denial of Service attacks that exploit vulnerabilities in HAProxy.

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