{"id":"CVE-2022-34750","aliases":["BIT-mediawiki-2022-34750","EUVD-2022-37698","GHSA-vh8m-7c3c-7m5c"],"status":"published","title":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is...","description":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01314,"percentile":0.70976,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2022-06-28T12:20:42Z","modified":"2026-10-28T02:30:34Z","fixes":[{"ecosystem":"Bitnami","package":"mediawiki","fixed_in":["1.38.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mediawiki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.38.2"}]}]}],"products":[{"vendor":"mediawiki","product":"mediawiki"}],"references":[{"url":"https://phabricator.wikimedia.org/T308659","tags":["x_refsource_MISC","x_transferred","Mailing List","web"]},{"url":"https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","web"]},{"url":"https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-34750","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-vh8m-7c3c-7m5c"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/34xxx/CVE-2022-34750.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2022-34750","description":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.","status":"published","published":"2022-06-28T12:20:42Z","modified":"2024-08-03T09:22:09.26Z","updated_at":"2026-11-02T14:34:42.354707Z"}],"euvd":[{"id":"EUVD-2022-37698","description":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.","status":"published","published":"2022-06-28T12:20:42Z","modified":"2024-08-03T09:22:09Z","updated_at":"2026-11-03T03:25:28.472981Z"}],"ghsa":[{"id":"GHSA-vh8m-7c3c-7m5c","title":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is...","description":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.","status":"published","published":"2022-06-29T00:00:55Z","modified":"2023-01-27T05:04:37Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:42:30.494485Z"}],"nvd":[{"id":"CVE-2022-34750","description":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.","status":"published","published":"2022-06-28T13:15:12.817Z","modified":"2026-06-17T04:50:51.76Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:07:22.966735Z"}],"osv":[{"id":"BIT-mediawiki-2022-34750","description":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.","status":"published","published":"2024-03-06T11:04:59.679Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"},{"id":"CVE-2022-34750","description":"An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.","status":"published","published":"2022-06-28T12:20:42Z","modified":"2026-10-28T02:30:34.765477525Z","updated_at":"2026-11-02T15:44:25.860945Z"}]}}