Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mediawiki | Mediawiki | <= 1.38.1 |
Related Weaknesses (CWE)
References
- https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742Vendor Advisory
- https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9Vendor Advisory
- https://phabricator.wikimedia.org/T308659Mailing List
- https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742Vendor Advisory
- https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9Vendor Advisory
- https://phabricator.wikimedia.org/T308659Mailing List
FAQ
What is CVE-2022-34750?
CVE-2022-34750 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 larg...
How severe is CVE-2022-34750?
CVE-2022-34750 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-34750?
Check the references section above for vendor advisories and patch information. Affected products include: Mediawiki Mediawiki.