CVE-2022-34750
HIGHMediaWiki < 1.38.1 - Denial of Service via Unvalidated Lemma Length in Wikibase Lexeme
Title source: llmDescription
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 (3)
Core 3
Core References
Mailing List x_refsource_misc
https://phabricator.wikimedia.org/T308659
Vendor Advisory x_refsource_misc
https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742
Vendor Advisory x_refsource_misc
https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9
Scores
CVSS v3
7.5
EPSS
0.0045
EPSS Percentile
63.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-770
Status
published
Products (1)
mediawiki/mediawiki
< 1.38.1
Published
Jun 28, 2022
Tracked Since
Feb 18, 2026