========================================================================== Ubuntu Security Notice USN-8563-2 July 20, 2026
nginx regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: USN-8563-1 introduced a regression in nginx Software Description: - nginx: small, powerful, scalable web/proxy server Details: USN-8563-1 fixed vulnerabilities in nginx. One of the fixes introduced ABI changes that could cause issues with external modules. This update reverts the fix for CVE-2026-42533 pending further investigation. We apologize for the inconvenience. Original advisory details: It was discovered that nginx incorrectly handled certain map directives using regex matching and capture variables. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-42533) It was discovered that nginx had a use-after-free vulnerability in the ngx_http_ssi_module module when configured with Server-Side Includes, proxy_pass, and proxy buffering disabled directives. An attacker able to intercept traffic and control responses from an upstream server could possibly use this issue to cause nginx to crash, resulting in a denial of service. (CVE-2026-56434) It was discovered that nginx incorrectly handled certain requests in the ngx_http_slice_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-2026-60005) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS nginx 1.28.3-2ubuntu1.8 nginx-core 1.28.3-2ubuntu1.8 nginx-extras 1.28.3-2ubuntu1.8 nginx-full 1.28.3-2ubuntu1.8 nginx-light 1.28.3-2ubuntu1.8 Ubuntu 24.04 LTS nginx 1.24.0-2ubuntu7.15 nginx-core 1.24.0-2ubuntu7.15 nginx-extras 1.24.0-2ubuntu7.15 nginx-full 1.24.0-2ubuntu7.15 nginx-light 1.24.0-2ubuntu7.15 Ubuntu 22.04 LTS nginx 1.18.0-6ubuntu14.18 nginx-core 1.18.0-6ubuntu14.18 nginx-extras 1.18.0-6ubuntu14.18 nginx-full 1.18.0-6ubuntu14.18 nginx-light 1.18.0-6ubuntu14.18 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8563-2 https://ubuntu.com/security/notices/USN-8563-1 https://launchpad.net/bugs/2161362 Package Information: https://launchpad.net/ubuntu/+source/nginx/1.28.3-2ubuntu1.8 https://launchpad.net/ubuntu/+source/nginx/1.24.0-2ubuntu7.15 https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.18
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