Resource exhaustion in MediaWiki
CVE-2022-34750
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.013 (69.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.013 · change: +0.000
Affected products
Weakness classification (CWE)
References
- phabricator.wikimedia.org/T308659 (Mailing List)
- gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742 (Vendor Advisory)
- gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9 (Vendor Advisory)
Frequently asked questions
- What is CVE-2022-34750?
- CVE-2022-34750 is a high-severity vulnerability in MediaWiki, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2022-06-28.
- How severe is CVE-2022-34750?
- High severity. CVSS v3 base score is 7.5 out of 10.