========================================================================== Ubuntu Security Notice USN-8354-1 June 01, 2026
nginx vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in nginx. Software Description: - nginx: small, powerful, scalable web/proxy server Details: It was discovered that nginx did not properly validate source addresses in the HTTP/3 QUIC module. A remote attacker could possibly use this issue to bypass authorization checks or rate limiting. This issue only affected Ubuntu 25.04 and Ubuntu 25.10. (CVE-2026-40460) It was discovered that nginx contained a use-after-free vulnerability in the ngx_http_ssl_module module when client certificate verification and OCSP validation were enabled. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly modify data in memory. (CVE-2026-40701) It was discovered that nginx did not properly handle certain proxied responses in the ngx_http_charset_module module. A remote attacker could possibly use this issue to obtain sensitive information or cause nginx to crash, resulting in a denial of service. (CVE-2026-42934) It was discovered that nginx did not properly process certain SCGI and uWSGI responses. An attacker able to perform a machine-in-the-middle attack could possibly use this issue to obtain sensitive information or cause nginx to crash, resulting in a denial of service. (CVE-2026-42946) It was discovered that nginx incorrectly handled certain rewrite rules in the ngx_http_rewrite_module module. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-9256) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS nginx 1.28.3-2ubuntu1.2 nginx-core 1.28.3-2ubuntu1.2 nginx-extras 1.28.3-2ubuntu1.2 nginx-full 1.28.3-2ubuntu1.2 nginx-light 1.28.3-2ubuntu1.2 Ubuntu 25.10 nginx 1.28.0-6ubuntu1.4 nginx-core 1.28.0-6ubuntu1.4 nginx-extras 1.28.0-6ubuntu1.4 nginx-full 1.28.0-6ubuntu1.4 nginx-light 1.28.0-6ubuntu1.4 Ubuntu 24.04 LTS nginx 1.24.0-2ubuntu7.9 nginx-core 1.24.0-2ubuntu7.9 nginx-extras 1.24.0-2ubuntu7.9 nginx-full 1.24.0-2ubuntu7.9 nginx-light 1.24.0-2ubuntu7.9 Ubuntu 22.04 LTS nginx 1.18.0-6ubuntu14.12 nginx-core 1.18.0-6ubuntu14.12 nginx-extras 1.18.0-6ubuntu14.12 nginx-full 1.18.0-6ubuntu14.12 nginx-light 1.18.0-6ubuntu14.12 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8354-1 CVE-2026-40460, CVE-2026-40701, CVE-2026-42934, CVE-2026-42946, CVE-2026-9256 Package Information: https://launchpad.net/ubuntu/+source/nginx/1.28.3-2ubuntu1.2 https://launchpad.net/ubuntu/+source/nginx/1.28.0-6ubuntu1.4 https://launchpad.net/ubuntu/+source/nginx/1.24.0-2ubuntu7.9 https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.12
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