What’s Vulnerable › Vulnerabilities

CVE-2022-34750

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-06-28 · updated 2026-06-17
• Weakness: CWE-770

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.

Affected products

• Wikimedia Foundation MediaWiki: through 1.38.1

References

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

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