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OpenAdvisories
Medium ALSA-2026:55804 1 CVE

Moderate: nghttp2 security update

Published Aug 17, 2026 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

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.

Fixed packages 3

ReleasePackageFixed in
AlmaLinux · 8 libnghttp2 1.33.0-6.el8_10.3
AlmaLinux · 8 libnghttp2-devel 1.33.0-6.el8_10.3
AlmaLinux · 8 nghttp2 1.33.0-6.el8_10.3

Vulnerabilities 1

  • Medium 5.4
    CVE-2026-58055

    nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

    nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A …

    nghttp2 nghttp2 fluent-bit nghttp2 Debian Ubuntu Azure Linux Alpine Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-58055
  • report
    https://bugzilla.redhat.com/2493954
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-55804.html