RHSA-2026:29874HighCVSS 8.1

Red Hat Security Advisory: nginx security update

Published
June 25, 2026
Last Modified
November 2, 2026

🔗 CVE IDs covered (1)

CVE-2026-9256 →

📋 Description

CVE-2026-9256 — nginx: ngx_http_rewrite_module: code execution and denial of service

🎯 Affected products101

  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-2:1.26.3-6.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-2:1.26.3-6.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-2:1.26.3-6.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-2:1.26.3-6.el10_2.4.src as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-2:1.26.3-6.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-all-modules-2:1.26.3-6.el10_2.4.noarch as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-2:1.26.3-6.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-2:1.26.3-6.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-2:1.26.3-6.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-2:1.26.3-6.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-debuginfo-2:1.26.3-6.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-debuginfo-2:1.26.3-6.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-core-debuginfo-2:1.26.3-6.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-debuginfo-2:1.26.3-6.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-core-debuginfo-2:1.26.3-6.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-debuginfo-2:1.26.3-6.el10_2.4.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-core-debuginfo-2:1.26.3-6.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-core-debuginfo-2:1.26.3-6.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-debuginfo-2:1.26.3-6.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-debuginfo-2:1.26.3-6.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-debuginfo-2:1.26.3-6.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-debuginfo-2:1.26.3-6.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-debuginfo-2:1.26.3-6.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-debuginfo-2:1.26.3-6.el10_2.4.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-debuginfo-2:1.26.3-6.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-debuginfo-2:1.26.3-6.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • nginx-debugsource-2:1.26.3-6.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • nginx-debugsource-2:1.26.3-6.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • +71 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: To mitigate this vulnerability, use named captures instead of unnamed captures in rewrite definitions. For example, the following rewrite directive uses unnamed PCRE capture groups, $1 and $2: ~~~ rewrite ^/users/([0-9]+)/profile/(.*)$ /profile.php?id=$1&tab=$2 last; ~~~ To mitigate this vulnerability for this example, replace $1 and $2 with the appropriate named captures, $user_id and $section: ~~~ rewrite ^/users/(?<user_id>[0-9]+)/profile/(?<section>.*)$ /profile.php?id=$user_id&tab=$section last; ~~~

🔗 References (4)