What’s Vulnerable › Vulnerabilities

CVE-2021-46149

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-10 · updated 2026-06-17
• Weakness: CWE-400

Description

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. A denial of service (resource consumption) can be accomplished by searching for a very long key in a Language Name Search.

Affected products

• Wikimedia Foundation MediaWiki: before 1.35.5; from 1.36.0 before 1.36.3; from 1.37.0 before 1.37.1 — fixed in 1.35.5, 1.36.3, 1.37.1

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35.5, 1.36.3, 1.37.1. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/q/Ide32704cca578b9aecbce34bdcc0ac25c2a09a4d
• https://phabricator.wikimedia.org/T293749
• https://gerrit.wikimedia.org/r/q/Ide32704cca578b9aecbce34bdcc0ac25c2a09a4d
• https://phabricator.wikimedia.org/T293749

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