RHSA-2026:55804: Moderate: nghttp2 security update

Published Aug 17, 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

24 affected componentsFixes available
redhat/nghttp2<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2-debuginfo<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2-debuginfo<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/nghttp2-debuginfo<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/nghttp2-debuginfo<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/nghttp2-debugsource<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/nghttp2-debugsource<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2-debuginfo<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/nghttp2-debuginfo<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/nghttp2-debugsource<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2<1.33.0-6.el8_10.3.aa
1.33.0-6.el8_10.3.aa
redhat/libnghttp2-debuginfo<1.33.0-6.el8_10.3.aa
1.33.0-6.el8_10.3.aa
redhat/nghttp2-debuginfo<1.33.0-6.el8_10.3.aa
1.33.0-6.el8_10.3.aa
redhat/nghttp2-debugsource<1.33.0-6.el8_10.3.aa
1.33.0-6.el8_10.3.aa
redhat/libnghttp2-devel<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2-devel<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/nghttp2<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2-devel<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/nghttp2<1.33.0-6.el8_10.3
1.33.0-6.el8_10.3
redhat/libnghttp2-devel<1.33.0-6.el8_10.3.aa
1.33.0-6.el8_10.3.aa
redhat/nghttp2<1.33.0-6.el8_10.3.aa
1.33.0-6.el8_10.3.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 1.33.0-6.el8_10.3
  2. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3
  3. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3
  4. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3
  5. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3
  6. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3.aa
  7. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3.aa
  8. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3.aa
  9. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3.aa
  10. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3
  11. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3.aa
  12. Upgrade

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

    Fixed in 1.33.0-6.el8_10.3.aa
  13. Compensating control

    Apply the Red Hat security update for the nghttp2 moderate security advisory referenced for the HTTP Request/Response Smuggling and Response-Queue Poisoning issue (CVE-2026-58055), as described in the linked advisory article (https://access.redhat.com/articles/11258).

Event History

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

1

What is the severity of RHSA-2026:55804?

The severity of RHSA-2026:55804 is classified as moderate.

2

What vulnerabilities are addressed by RHSA-2026:55804?

RHSA-2026:55804 addresses HTTP Request/Response Smuggling and Response-Queue Poisoning vulnerabilities identified by CVE-2026-58055.

3

How do I fix RHSA-2026:55804?

To fix RHSA-2026:55804, you should update to the latest version of the affected packages, including redhat/nghttp2 and redhat/libnghttp2.

4

What software is affected by RHSA-2026:55804?

The affected software includes redhat/nghttp2, redhat/libnghttp2, and their associated debuginfo and development packages.

5

When was RHSA-2026:55804 published?

RHSA-2026:55804 was published on August 17, 2026.

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