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OpenAdvisories
Medium RHSA-2026:55804 1 CVE

Red Hat Security Advisory: nghttp2 security update

Published Aug 18, 2026 · Updated Oct 15, 2026

Ecosystem: Red Hat

Fixed packages 10

ReleasePackageFixed in
Red Hat · RHEL 8 enterprise_linux:8::baseos libnghttp2 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::baseos libnghttp2-debuginfo 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::baseos nghttp2 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::baseos nghttp2-debuginfo 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::baseos nghttp2-debugsource 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::crb libnghttp2-debuginfo 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::crb libnghttp2-devel 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::crb nghttp2 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::crb nghttp2-debuginfo 0:1.33.0-6.el8_10.3
Red Hat · RHEL 8 enterprise_linux:8::crb nghttp2-debugsource 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

  • article
    https://access.redhat.com/security/updates/classification/#moderate
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2493954
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_55804.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-58055
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-58055
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-58055
  • article
    https://github.com/bikini/exploitarium/tree/main/nghttp2-nghttpx-upgrade-queue-poison-poc
  • article
    https://github.com/nghttp2/nghttp2/commit/ab28105c4a0197da24f8bfc414bc116055249e1e
  • article
    https://www.vulncheck.com/advisories/nghttp2-nghttpx-http-request-response-smuggling-via-upgrade-request-with-content-length