Skip to content
OpenAdvisories
Medium RLSA-2026:55804 1 CVE

Moderate: nghttp2 security update

Published Aug 18, 2026 · Updated Aug 18, 2026

Ecosystem: Rocky Linux

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 1

ReleasePackageFixed in
Rocky Linux · 8 nghttp2 0:1.33.0-6.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://bugzilla.redhat.com/show_bug.cgi?id=2493954
  • advisory
    https://access.redhat.com/errata/RHSA-2026:55804