{"id":"USN-8563-2","summary":"nginx regression","details":"USN-8563-1 fixed vulnerabilities in nginx. One of the fixes introduced ABI\nchanges that could cause issues with external modules. This update reverts\nthe fix for CVE-2026-42533 pending further investigation.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that nginx incorrectly handled certain map directives\n using regex matching and capture variables. A remote attacker could use\n this issue to cause nginx to crash, resulting in a denial of service, or\n possibly execute arbitrary code. (CVE-2026-42533)\n\n It was discovered that nginx had a use-after-free vulnerability in the\n ngx_http_ssi_module module when configured with Server-Side Includes,\n proxy_pass, and proxy buffering disabled directives. An attacker able to\n intercept traffic and control responses from an upstream server could\n possibly use this issue to cause nginx to crash, resulting in a denial of\n service. (CVE-2026-56434)\n\n It was discovered that nginx incorrectly handled certain requests in the\n ngx_http_slice_module module. A remote attacker could possibly use this\n issue to obtain sensitive information or cause nginx to crash, resulting\n in a denial of service. (CVE-2026-60005)","modified":"2026-07-21T18:52:50.569000760Z","published":"2026-07-20T21:37:33Z","related":["UBUNTU-CVE-2026-42533"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8563-2"},{"type":"REPORT","url":"https://launchpad.net/bugs/2161362"}],"affected":[{"package":{"name":"nginx","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/nginx?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-6ubuntu14.18"}]}],"versions":["1.18.0-6ubuntu11","1.18.0-6ubuntu12","1.18.0-6ubuntu14","1.18.0-6ubuntu14.1","1.18.0-6ubuntu14.2","1.18.0-6ubuntu14.3","1.18.0-6ubuntu14.4","1.18.0-6ubuntu14.5","1.18.0-6ubuntu14.6","1.18.0-6ubuntu14.7","1.18.0-6ubuntu14.8","1.18.0-6ubuntu14.10","1.18.0-6ubuntu14.11","1.18.0-6ubuntu14.12","1.18.0-6ubuntu14.13","1.18.0-6ubuntu14.14","1.18.0-6ubuntu14.15","1.18.0-6ubuntu14.16","1.18.0-6ubuntu14.17"],"ecosystem_specific":{"availability":"No subscription 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subscription 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