CVE-2022-34750

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.23%
Vendor Advisory wikimedia.org Vendor Advisory wikimedia.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://phabricator.wikimedia.org/T308659 mailing list
https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742 vendor advisory
https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2022-34750?
CVE-2022-34750 has been scored as a high severity vulnerability.
How to fix CVE-2022-34750?
To fix CVE-2022-34750, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-34750 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-34750 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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