RHSA-2026:59496HighCVSS 8.2

Red Hat Security Advisory: nginx:1.26 security update

Published
August 25, 2026
Last Modified
November 2, 2026

🔗 CVE IDs covered (2)

CVE-2026-60005 →CVE-2026-56434 →

📋 Description

CVE-2026-56434 — nginx: NGINX: Heap buffer over-read allows memory modification or denial of service CVE-2026-60005 — nginx: NGINX: Memory disclosure and denial of service in ngx_http_slice_module

🎯 Affected products68

  • Red Hat Enterprise Linux AppStream (v. 9)
  • nginx-2:1.26.3-9.module+el9.8.0+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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+24599+8fde0ff7.3.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 prevent exploitation, avoid configuring NGINX with `ngx_http_ssi_module` when `proxy_pass` and `proxy_buffering off` are simultaneously active. If Server-Side Includes (SSI) are not essential, disable the `ngx_http_ssi_module` by removing or commenting out the `ssi on;` directive. Alternatively, ensure `proxy_buffering` is explicitly enabled (`proxy_buffering on;`) when `proxy_pass` is used with SSI. A reload or restart of the NGINX service is necessary for configuration changes to apply, which may cause a brief service interruption. Workaround: To mitigate this issue, disable the ngx_http_slice_module entirely if it is not required. If the module must be used, avoid unnamed regex captures with the slice directive and explicitly disable proxy_cache_background_update. Reload or restart the NGINX service to apply these changes. Please note this may cause a brief service interruption.

🔗 References (5)