CVE-2026-126565

MEDIUM 4.3

Semantic MediaWiki 3.0.0 before 7.4.1 DoS via Exponential Concept Expansion

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-407
Vendor	semanticmediawiki
Product	semanticmediawiki
Published	Nov 11, 2026

Stay Ahead of the Next One

Get instant alerts for semanticmediawiki semanticmediawiki

Be the first to know when new medium vulnerabilities affecting semanticmediawiki semanticmediawiki are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

SemanticMediaWiki / SemanticMediaWiki

3.0.0 < 7.4.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-24v2-mf3g-84ch github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/86ce13254ffd91406ef43ea403ae072a7e3a38b3 github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.4.1 github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/Elastic/QueryEngine/DescriptionInterpreters/ConceptDescriptionInterpreter.php#L34-L75 github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/SPARQLStore/QueryEngine/DescriptionInterpreters/ConceptDescriptionInterpreter.php#L49-L105 vulncheck.com: https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.4.1-dos-via-exponential-concept-expansion

Credits

AlpetGexha