Detections
Analytics
CVE-2022-34750
high
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.
References
https://phabricator.wikimedia.org/T308659
https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9
https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742