RHSA-2026:54662: Moderate: nghttp2 security update

Published Aug 13, 2026
·
Updated

libnghttp2 is a library implementing the Hypertext Transfer Protocol version 2 (HTTP/2) protocol in C.Security Fix(es): nghttp2: nghttp2: HTTP Request/Response Smuggling and Response-Queue Poisoning via ambiguous HTTP/1.1 Upgrade requests (CVE-2026-58055) 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.

Affected Software

48 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Red Hat CodeReady Linux Builder for ARM 64
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat CodeReady Linux Builder for Power, little endian
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for ARM 64 - 4 years of updates
Red Hat Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
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 Power, little endian - Extended Update Support
Red Hat Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Red Hat CodeReady Linux Builder for x86_64
Red Hat Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for x86_64
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Red Hat Enterprise Linux for IBM z Systems - 4 years of updates
Red Hat Red Hat Enterprise Linux for ARM 64
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
redhat/nghttp2<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2-debuginfo<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2-debuginfo<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/nghttp2-debuginfo<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/nghttp2-debuginfo<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/nghttp2-debugsource<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/nghttp2-debugsource<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2-debuginfo<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/nghttp2-debuginfo<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/nghttp2-debugsource<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2<1.43.0-6.el9_8.2.aa
1.43.0-6.el9_8.2.aa
redhat/libnghttp2-debuginfo<1.43.0-6.el9_8.2.aa
1.43.0-6.el9_8.2.aa
redhat/nghttp2-debuginfo<1.43.0-6.el9_8.2.aa
1.43.0-6.el9_8.2.aa
redhat/nghttp2-debugsource<1.43.0-6.el9_8.2.aa
1.43.0-6.el9_8.2.aa
redhat/libnghttp2-devel<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2-devel<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/nghttp2<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2-devel<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/nghttp2<1.43.0-6.el9_8.2
1.43.0-6.el9_8.2
redhat/libnghttp2-devel<1.43.0-6.el9_8.2.aa
1.43.0-6.el9_8.2.aa
redhat/nghttp2<1.43.0-6.el9_8.2.aa
1.43.0-6.el9_8.2.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/nghttp2 to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2
  2. Upgrade

    Upgrade redhat/libnghttp2 to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2
  3. Upgrade

    Upgrade redhat/libnghttp2-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2
  4. Upgrade

    Upgrade redhat/nghttp2-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2
  5. Upgrade

    Upgrade redhat/nghttp2-debugsource to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2
  6. Upgrade

    Upgrade redhat/libnghttp2 to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2.aa
  7. Upgrade

    Upgrade redhat/libnghttp2-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2.aa
  8. Upgrade

    Upgrade redhat/nghttp2-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2.aa
  9. Upgrade

    Upgrade redhat/nghttp2-debugsource to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2.aa
  10. Upgrade

    Upgrade redhat/libnghttp2-devel to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2
  11. Upgrade

    Upgrade redhat/libnghttp2-devel to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2.aa
  12. Upgrade

    Upgrade redhat/nghttp2 to a version that resolves this vulnerability.

    Fixed in 1.43.0-6.el9_8.2.aa
  13. Upgrade

    Upgrade libnghttp2 (nghttp2) to a version that resolves this vulnerability.

    Patch CVE-2026-58055

Event History

Aug 13, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·04:03 PM
Data Sourced
via Red Hat·04:03 PM
Severity

Frequently Asked Questions

1

What is the severity of RHSA-2026:54662?

The severity of RHSA-2026:54662 is medium with a score of 4.

2

What does RHSA-2026:54662 address?

RHSA-2026:54662 addresses a security update for nghttp2 to mitigate vulnerabilities.

3

How do I fix RHSA-2026:54662?

To fix RHSA-2026:54662, users should apply the latest available updates as provided in the errata.

4

Which software is affected by RHSA-2026:54662?

RHSA-2026:54662 affects various Red Hat Enterprise Linux versions across multiple architectures including Power and ARM.

5

When was RHSA-2026:54662 published?

RHSA-2026:54662 was published on August 13, 2026.

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