{"id":"CVE-2021-41800","aliases":["BIT-mediawiki-2021-41800","GHSA-c8wv-qwwc-6j73"],"url":"https://o3.security/vulnerability/CVE-2021-41800","summary":"MediaWiki allows a denial of service","details":"MediaWiki before 1.36.2 allows a denial of service (resource consumption because of lengthy query processing time). Visiting Special:Contributions can sometimes result in a long running SQL query because PoolCounter protection is mishandled.","published":"2021-10-11T08:15:06.813Z","modified":"2026-07-08T06:00:43.646018431Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"mediawiki/core","fixedVersion":"1.36.2"}],"fix":{"url":"https://github.com/wikimedia/mediawiki/commit/781caf83dba90c18349f930bbaaa0e89f003f874","label":"wikimedia/mediawiki@781caf8"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/"},{"type":"WEB","url":"https://lists.wikimedia.org/hyperkitty/list/wikitech-l%40lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202305-24"},{"type":"REPORT","url":"https://phabricator.wikimedia.org/T284419"},{"type":"FIX","url":"https://github.com/wikimedia/mediawiki/commit/781caf83dba90c18349f930bbaaa0e89f003f874"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:00:43.646018431Z"}}