CVE-2026-126565 · Package
NO FIX YET · SEE WHAT TO DO
Semantic MediaWiki's ElasticStore and SPARQLStore re-expand concept pages without limits, so a chain of Concept pages fans out. A user with page-edit rights can make queries exhaust CPU and memory, causing denial of service.
first public Nov 10, 2026 · 1 source
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Wikis running Semantic MediaWiki 3.0.0 through 7.4.0 with the ElasticStore or SPARQLStore backend are exposed. Users who can edit pages are the ones who can trigger the fan-out, so wikis with open or broad edit rights carry more risk. Wikis on the default store or on versions outside the range can skip it.
Not affected if auth-required, default-store
Who cares mediawiki, self-hosted, semantic-mediawiki
composer show mediawiki/semantic-media-wiki7.4.1 or later (per the NVD range, versions before 7.4.1 from 3.0.0 are affected)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.
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