CVE-2022-34750 Information

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.

Reference

https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742 https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9 https://phabricator.wikimedia.org/T308659