CVE-2022-34750

HIGH

MediaWiki < 1.38.1 - Denial of Service via Unvalidated Lemma Length in Wikibase Lexeme

Title source: llm
STIX 2.1

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 (3)

Core 3

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