RHSA-2026:27197HighCVSS 8.1

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

Published
June 19, 2026
Last Modified
August 23, 2026

🔗 CVE IDs covered (2)

CVE-2026-42055 →CVE-2026-48142 →

📋 Description

CVE-2026-42055 — nginx: NGINX: Arbitrary code execution or Denial of Service via heap-based buffer overflow with crafted HTTP/2 headers CVE-2026-48142 — nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read

🎯 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, ensure that the `ignore_invalid_headers` directive is set to `on` in your NGINX configuration, or reduce the size specified by the `large_client_header_buffers` directive to 2 megabytes or less. These changes require an NGINX service reload or restart to take effect. Reloading the NGINX service is generally safe, but a restart will briefly interrupt service. Workaround: To mitigate this issue, avoid configuring NGINX with both `source_charset utf-8;` and an additional `charset` directive within the same location block in the `ngx_http_charset_module`. If these directives are not essential for your NGINX deployment, removing one or both will prevent the vulnerability from being exploited. After modifying the NGINX configuration, reload the NGINX service using `systemctl reload nginx`. This action may temporarily interrupt active connections.

🔗 References (6)