{"id":"USN-8563-5","summary":"A security issue was fixed in nginx.","details":"USN-8563-1 fixed vulnerabilities in nginx. The fix for CVE-2026-42533 was\nbacked out in USN-8563-2 because it could cause a regression. This update\nincludes a better fix for CVE-2026-42533.\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":"2026-09-14T22:12:16.449768280Z","published":"2026-09-14T11:35:12Z","related":["UBUNTU-CVE-2026-42533"],"upstream":["CVE-2026-42533","UBUNTU-CVE-2026-42533"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8563-5"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42533"}],"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":"1.18.0-6ubuntu14.21"}]}],"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","1.18.0-6ubuntu14.18","1.18.0-6ubuntu14.19","1.18.0-6ubuntu14.20"],"ecosystem_specific":{"binaries":[{"binary_name":"libnginx-mod-http-auth-pam","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"libnginx-mod-http-cache-purge","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"libnginx-mod-http-dav-ext","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"libnginx-mod-http-echo","binary_version":"1.18.0-6ubuntu14.21"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-http-fancyindex"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-http-geoip"},{"binary_name":"libnginx-mod-http-geoip2","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"libnginx-mod-http-headers-more-filter","binary_version":"1.18.0-6ubuntu14.21"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-http-image-filter"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-http-ndk"},{"binary_name":"libnginx-mod-http-perl","binary_version":"1.18.0-6ubuntu14.21"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-http-subs-filter"},{"binary_name":"libnginx-mod-http-uploadprogress","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"libnginx-mod-http-upstream-fair","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"libnginx-mod-http-xslt-filter","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"libnginx-mod-mail","binary_version":"1.18.0-6ubuntu14.21"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-nchan"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-rtmp"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-stream"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-stream-geoip"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"libnginx-mod-stream-geoip2"},{"binary_name":"nginx","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"nginx-common","binary_version":"1.18.0-6ubuntu14.21"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"nginx-core"},{"binary_version":"1.18.0-6ubuntu14.21","binary_name":"nginx-extras"},{"binary_name":"nginx-full","binary_version":"1.18.0-6ubuntu14.21"},{"binary_name":"nginx-light","binary_version":"1.18.0-6ubuntu14.21"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8563-5.json","cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2026-42533","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"nginx","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/nginx?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.24.0-2ubuntu7.18"}]}],"versions":["1.24.0-1ubuntu1","1.24.0-2ubuntu1","1.24.0-2ubuntu2","1.24.0-2ubuntu3","1.24.0-2ubuntu4","1.24.0-2ubuntu6","1.24.0-2ubuntu7","1.24.0-2ubuntu7.1","1.24.0-2ubuntu7.3","1.24.0-2ubuntu7.4","1.24.0-2ubuntu7.5","1.24.0-2ubuntu7.6","1.24.0-2ubuntu7.7","1.24.0-2ubuntu7.8","1.24.0-2ubuntu7.9","1.24.0-2ubuntu7.10","1.24.0-2ubuntu7.11","1.24.0-2ubuntu7.12","1.24.0-2ubuntu7.13","1.24.0-2ubuntu7.14","1.24.0-2ubuntu7.15","1.24.0-2ubuntu7.16","1.24.0-2ubuntu7.17"],"ecosystem_specific":{"binaries":[{"binary_version":"1.24.0-2ubuntu7.18","binary_name":"libnginx-mod-http-geoip"},{"binary_name":"libnginx-mod-http-image-filter","binary_version":"1.24.0-2ubuntu7.18"},{"binary_name":"libnginx-mod-http-perl","binary_version":"1.24.0-2ubuntu7.18"},{"binary_name":"libnginx-mod-http-xslt-filter","binary_version":"1.24.0-2ubuntu7.18"},{"binary_name":"libnginx-mod-mail","binary_version":"1.24.0-2ubuntu7.18"},{"binary_version":"1.24.0-2ubuntu7.18","binary_name":"libnginx-mod-stream"},{"binary_name":"libnginx-mod-stream-geoip","binary_version":"1.24.0-2ubuntu7.18"},{"binary_name":"nginx","binary_version":"1.24.0-2ubuntu7.18"},{"binary_name":"nginx-common","binary_version":"1.24.0-2ubuntu7.18"},{"binary_name":"nginx-core","binary_version":"1.24.0-2ubuntu7.18"},{"binary_version":"1.24.0-2ubuntu7.18","binary_name":"nginx-extras"},{"binary_version":"1.24.0-2ubuntu7.18","binary_name":"nginx-full"},{"binary_version":"1.24.0-2ubuntu7.18","binary_name":"nginx-light"}],"availability":"No 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