CVE-2022-34750

Name: CVE-2022-34750
Creator: NVD / NIST
Published: 2022-06-28T13:15:12.817+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.19%

Last modified Jun 17, 2026

CVE-2022-34750 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. EPSS estimates a 1.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.19%

64.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	<= 1.38.1

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

Timeline

Published: Jun 28, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-34750?

How severe is CVE-2022-34750?

CVE-2022-34750 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.19% probability of exploitation in the next 30 days.

How do I fix CVE-2022-34750?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-34750?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST