Vulnerability · Published Feb 2, 2026 · Assigned by wikimedia-foundation
CVE-2025-61634HTML rest endpoint needs PoolCounter and proper parser cache check
None 0.0
In plain English
A security flaw in MediaWiki from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)0.0None
Exploit odds (30 days)0.3%top 75.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Rest/Handler/PageHTMLHandler.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | mediawiki | 1:1.43.6+dfsg-1~deb13u1 | DEBIAN-CVE-2025-61634 |
| Debian:14 | mediawiki | 1:1.43.5+dfsg-1 | DEBIAN-CVE-2025-61634 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2025-61634 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2025-61634 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2025-61634 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wikimedia Foundation | MediaWiki | * – before 1.39.14, 1.43.4, 1.44.1 |