RHSA-2026:29151HighCVSS 8.1

Red Hat Security Advisory: nginx:1.26 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 products68

  • Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.aarch64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.ppc64le (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.s390x (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.src (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.x86_64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-all-modules-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.noarch (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-core-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.aarch64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-core-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.ppc64le (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-core-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.s390x (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-core-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.x86_64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-core-debuginfo-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.aarch64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-core-debuginfo-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.ppc64le (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-core-debuginfo-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.s390x (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-core-debuginfo-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.x86_64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-debuginfo-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.aarch64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-debuginfo-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.ppc64le (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-debuginfo-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.s390x (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-debuginfo-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.x86_64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-debugsource-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.aarch64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-debugsource-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.ppc64le (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-debugsource-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.s390x (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-debugsource-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.x86_64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-filesystem-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.noarch (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-mod-devel-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.aarch64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-mod-devel-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.ppc64le (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-mod-devel-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.s390x (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-mod-devel-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.x86_64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-mod-http-image-filter-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.aarch64 (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-mod-http-image-filter-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.ppc64le (nginx:1.26) as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • +38 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)