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.

published 2022-01-07 4 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2021-46149 , EUVD-2021-32849

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 69%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

bitnami mediawiki 1.35.5, 1.36.3, 1.37.1
mediawiki mediawiki 1.35.5, 1.36.3, 1.37.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-46149 updated 2026-06-26 cvss 7.5

mediawiki: searching for a very long key may lead to DoS

Red Hat OpenShift Container Platform 3.11 mediawiki
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.25% chance of exploitation in the next 30 days, higher than 69% 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	<1.35.5 >=1.36.0, <1.36.3 >=1.37.0, <1.37.1	1.35.5 1.36.3 1.37.1

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

phabricator.wikimedia.org /T293749
third-party-advisory, web
gerrit.wikimedia.org /r/q/Ide32704cca578b9aecbce34bdcc0ac25c2a09a4d
third-party-advisory, web
nvd.nist.gov /vuln/detail/CVE-2021-46149
web

Sources

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.

Summary