Description
An issue was discovered in ApiPageSet.php in MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. It allows attackers to cause a denial of service (unbounded loop and RequestTimeoutException) when querying pages redirected to other variants with redirects and converttitles set.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mediawiki | 1:1.39.5-1 | — |
| Debian 13 | mediawiki | 1:1.39.5-1 | — |
| Debian 12 | mediawiki | 1:1.39.5-1~deb12u1 | DSA-5520-1 |
| Debian 11 | mediawiki | 1:1.35.13-1~deb11u1 | DSA-5520-1 |
| Debian 10 | mediawiki | 1:1.31.16-1+deb10u7 | DLA-3671-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mediawiki | No fix yet | — |
| Ubuntu 26.04 LTS | mediawiki | No fix yet | — |
| Ubuntu 25.10 | mediawiki | No fix yet | — |
| Ubuntu 18.04 LTS | mediawiki | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | mediawiki | No fix yet | — |
| Ubuntu Pro 22.04 LTS | mediawiki | No fix yet | — |
| Ubuntu Pro 20.04 LTS | mediawiki | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | mediawiki/core | < 1.35.12 | 1.35.12 | GHSA-w5fx-cx7f-6vr9 |
| Packagist | mediawiki/core | >= 1.36.0, < 1.39.5 | 1.39.5 | GHSA-w5fx-cx7f-6vr9 |
| Packagist | mediawiki/core | >= 1.40.0, < 1.40.1 | 1.40.1 | GHSA-w5fx-cx7f-6vr9 |
Advisories 3
- DSA-5520-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3671-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2023-2594 MediaWiki: Mehre Schwachstellen BSI CERT-Bund (WID) · Nov 28, 2023