CVE-2022-34750 json
An issue was discovered in MediaWiki through 1.38.1.
published 2022-06-28 4 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2022-34750 , EUVD-2022-37698
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami mediawiki 1.38.2
Exploit prediction
1.31% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mediawiki | <1.38.2 |
1.38.2 |
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
gerrit.wikimedia.org
/r/q/I8171bfef73e525d73efa60b407ce147130ea4742
vendor-advisory, web
-
gerrit.wikimedia.org
/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9
vendor-advisory, web
-
phabricator.wikimedia.org
/T308659
mailing-list, web
-
nvd.nist.gov
/vuln/detail/CVE-2022-34750
web
Sources
- CVE List CVE-2022-34750
- NVD CVE-2022-34750
- OSV BIT-mediawiki-2022-34750
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.