{"id":"CVE-2026-126565","summary":"Semantic MediaWiki 3.0.0 before 7.4.1 DoS via Exponential Concept Expansion","details":"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.","aliases":["GHSA-24v2-mf3g-84ch"],"modified":"2026-11-12T02:48:34.807758120Z","published":"2026-11-11T02:36:00.573Z","database_specific":{"cwe_ids":["CWE-407"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126565.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126565.json"},{"type":"ADVISORY","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.4.1"},{"type":"ADVISORY","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-24v2-mf3g-84ch"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126565"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.4.1-dos-via-exponential-concept-expansion"},{"type":"FIX","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/86ce13254ffd91406ef43ea403ae072a7e3a38b3"},{"type":"PACKAGE","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki"},{"type":"ARTICLE","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/Elastic/QueryEngine/DescriptionInterpreters/ConceptDescriptionInterpreter.php#L34-L75"},{"type":"ARTICLE","url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/7.4.0/src/SPARQLStore/QueryEngine/DescriptionInterpreters/ConceptDescriptionInterpreter.php#L49-L105"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/semanticmediawiki/semanticmediawiki","events":[{"introduced":"abdec882fc57dd5b54cab15e8f419056164ee66a"},{"fixed":"bcc3cbf4884f0474232a68d3eff060f93a506379"},{"fixed":"86ce13254ffd91406ef43ea403ae072a7e3a38b3"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"3.0.0"},{"fixed":"7.4.1"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"86ce13254ffd91406ef43ea403ae072a7e3a38b3"}]},{"source":"REFERENCES_TAG","original_tag":"7.4.1","range":[{"fixed":"bcc3cbf4884f0474232a68d3eff060f93a506379"}]}]}}],"versions":["7.4.0","7.3.1","7.3.0","7.2.1","7.2.0","7.1.0","7.0.0","6.0.1","6.0.0","5.1.0","5.0.2","5.0.1","5.0.0","4.2.0","4.1.3","4.1.2","4.1.1","4.1.0","4.0.2","4.0.1","4.0.0","3.2.0","3.2.0-rc.1","3.2.0-rc.2","3.1.0","3.1.0-rc.1","3.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126565.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}