{"id":"ALSA-2021:2259","summary":"Important: nginx:1.18 security update","details":"nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage. \n\nSecurity Fix(es):\n\n* nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name (CVE-2021-23017)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","modified":"2026-01-30T00:46:54.000712Z","published":"2021-06-07T10:02:53Z","related":["CVE-2021-23017"],"references":[{"type":"ADVISORY","url":"https://errata.almalinux.org/8/ALSA-2021-2259.html"},{"type":"REPORT","url":"https://vulners.com/cve/CVE-2021-23017"}],"affected":[{"package":{"name":"nginx","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-all-modules","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-all-modules"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-filesystem","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-filesystem"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-http-image-filter","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-http-image-filter"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-http-image-filter","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-http-image-filter"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-http-perl","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-http-perl"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-http-perl","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-http-perl"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-http-xslt-filter","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-http-xslt-filter"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-http-xslt-filter","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-http-xslt-filter"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-mail","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-mail"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.5.0+36+48437aab.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-mail","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-mail"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}},{"package":{"name":"nginx-mod-stream","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/nginx-mod-stream"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.18.0-3.module_el8.4.0+2472+f736ed63.1.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:2259.json"}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