{"id":"CLSA-2026-1792487559","summary":"Fix CVE(s): CVE-2026-15176, CVE-2026-56434","details":"   * SECURITY UPDATE: heap buffer overflow when mapping a rewritten URI to a\n     path in a location using alias\n     - debian/patches/CVE-2026-15176.patch: reject URI to path mapping in\n       ngx_http_map_uri_to_path() when r-\u003euri_changed is set, so a rewrite\n       that shortens the URI below the alias location prefix can no longer\n       overflow the path buffer through $request_filename\n     - CVE-2026-15176\n   * SECURITY UPDATE: use-after-free via duplicate subrequest finalization\n     - debian/patches/CVE-2026-56434.patch: skip posting a request in\n       ngx_http_post_request() if it is already posted, and reset the\n       subrequest write event handler during finalization in\n       ngx_http_finalize_request(), so an SSI subrequest double-posted during\n       unbuffered proxying can no longer be finalized twice\n     - CVE-2026-56434","modified":"2026-10-26T09:32:05.641055816Z","published":"2026-10-20T09:12:52Z","upstream":["CVE-2026-15176","CVE-2026-56434"],"references":[{"type":"ADVISORY","url":"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1792487559.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15176"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56434"}],"affected":[{"package":{"name":"libnginx-mod-http-auth-pam","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-auth-pam?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-cache-purge","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-cache-purge?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-dav-ext","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-dav-ext?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-echo","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-echo?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-fancyindex","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-fancyindex?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-geoip","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-geoip?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-geoip2","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-geoip2?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-headers-more-filter","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-headers-more-filter?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-image-filter","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-image-filter?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-lua","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-lua?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-ndk","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-ndk?distro=ubuntu-20.04"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.0-0ubuntu1.7+tuxcare.els10"}]}],"database_specific":{"source":"https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1792487559.json"}},{"package":{"name":"libnginx-mod-http-perl","ecosystem":"TuxCare:Ubuntu:20.04","purl":"pkg:deb/tuxcare/libnginx-mod-http-perl?distro=ubuntu-20.04"},"ranges":[{"type"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