CVE-2026-126565
Semantic MediaWiki 3.0.0 before 7.4.1 DoS via Exponential Concept Expansion
Description
Semantic MediaWiki 3.0.0 before 7.4.1 contains a denial of service vulnerability in the ElasticStore and SPARQLStore ConceptDescriptionInterpreter classes, which re-expand concepts without memoization or an expansion budget. Users with page-edit rights can build acyclic chains of Concept: pages that fan out, so queries via concept page views, Special:Ask, or api.php action=ask exhaust CPU and memory.
INFO
Published Date :
Nov. 11, 2026, 2:36 a.m.
Last Modified :
Nov. 11, 2026, 2:36 a.m.
Remotely Exploit :
Yes !
Source :
VulnCheck
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 |
Solution
- Update Semantic MediaWiki to version 7.4.1 or later.
- Apply available security patches for the affected components.
- Monitor system resources for unusual CPU and memory usage.
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CVE-2026-126565 vulnerability anywhere in the article.