RHSA-2026:20351HighCVSS 8.1

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Published
May 23, 2026
Last Modified
August 9, 2026

🔗 CVE IDs covered (3)

CVE-2026-9256 →CVE-2026-40460 →CVE-2026-42530 →

📋 Description

CVE-2026-9256 — nginx: ngx_http_rewrite_module: code execution and denial of service CVE-2026-40460 — nginx: NGINX: Authorization bypass via IP spoofing in HTTP/3 QUIC module CVE-2026-42530 — nginx: ngx_http_v3_module: use-after-free issue leads to denial of service

🎯 Affected products5

  • Red Hat Hardened Images
  • nginx-main@aarch64 as a component of Red Hat Hardened Images
  • nginx-main@noarch as a component of Red Hat Hardened Images
  • nginx-main@src as a component of Red Hat Hardened Images
  • nginx-main@x86_64 as a component of Red Hat Hardened Images

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ 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; ~~~ Workaround: To mitigate this issue, if the HTTP/3 QUIC module is not required, disable it in your NGINX configuration. This typically involves removing or commenting out the `quic` parameter from `listen` directives in your `nginx.conf` file. After modifying the configuration, a graceful reload or restart of the NGINX service is required for the changes to take effect. For example, use `sudo systemctl reload nginx` or `sudo systemctl restart nginx`. Workaround: To mitigate this vulnerability, disable HTTP/3 by removing quic from all listen directives.

🔗 References (8)