{"id":"CVE-2026-126565","kind":"vulnerability","aliases":["CVE-2026-126565"],"related":[],"title":"Semantic MediaWiki: users with edit rights can exhaust server CPU and memory","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.","summary":"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.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["mediawiki","package","self-hosted","semantic-mediawiki"],"not_affected_if":["auth-required","default-store"],"how_to_check":"- Check the installed Semantic MediaWiki version in Special:Version or `composer show mediawiki/semantic-media-wiki`\n- Check whether the wiki uses the ElasticStore or SPARQLStore backend (unknown otherwise)","fix":"- Semantic MediaWiki: move to `7.4.1` or later (per the NVD range, versions before 7.4.1 from 3.0.0 are affected)","status":"open","published_at":"2026-11-11T03:16:50+00:00","first_seen_at":"2026-11-11T03:25:00+00:00","triaged_at":"2026-11-11T03:26:31+00:00","updated_at":"2026-11-11T03:26:31+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-11T03:26:31Z","model":"claude-haiku-5-5","output":{"fix":"- Semantic MediaWiki: move to `7.4.1` or later (per the NVD range, versions before 7.4.1 from 3.0.0 are affected)","reach":"network","title":"Semantic MediaWiki: users with edit rights can exhaust server CPU and memory","impact":"medium","summary":"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.","audience":"businesses","category":"package","nicknames":[],"who_cares":["semantic-mediawiki","mediawiki","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"Wiki server CPU and memory exhausted, causing denial of service","analyst_note":"Confirm the ElasticStore/SPARQLStore backend condition and the exact fixed version in the vendor advisory.','product_name':","how_to_check":"- Check the installed Semantic MediaWiki version in Special:Version or `composer show mediawiki/semantic-media-wiki`\n- Check whether the wiki uses the ElasticStore or SPARQLStore backend (unknown otherwise)","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["default-store","auth-required"],"who_is_affected":"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.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.00079,"input_tokens":4690,"output_tokens":642,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-126565':15A,18A '-2026':14A,17A '3.0.0':68C '7.4.1':70C 'action':121C 'acycl':103C 'api.php':120C 'ask':118C,122C 'budget':94C 'build':102C 'caus':62B 'chain':42B,104C 'class':83C 'concept':36B,44B,88C,106C,114C 'conceptdescriptioninterpret':82C 'contain':71C 'cpu':10A,59B,124C 'cve':13A,16A 'denial':63B,73C 'edit':5A,53B,99C 'elasticstor':30B,79C 'exhaust':8A,58B,123C 'expand':35B,87C 'expans':93C 'fan':46B,109C 'host':23B 'limit':39B 'make':56B 'mediawiki':2A,19B,26B,28B,67C 'memoiz':90C 'memori':12A,61B,126C 'packag':20B 'page':37B,45B,52B,98C,107C,115C 'page-edit':51B,97C 'queri':57B,112C 're':34B,86C 're-expand':33B,85C 'right':6A,54B,100C 'self':22B 'self-host':21B 'semant':1A,25B,27B,66C 'semantic-mediawiki':24B 'server':9A 'servic':65B,75C 'sparqlstor':32B,81C 'special':117C 'user':3A,49B,95C 'via':113C 'view':116C 'vulner':76C 'without':38B,89C","nicknames":[],"mitigations":[],"who_affected":"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.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["mediawiki","medium","package","selfhosted","semanticmediawiki"],"campaign_type":null,"search_a":"'-126565':15A,18A '-2026':14A,17A 'cpu':10A 'cve':13A,16A 'edit':5A 'exhaust':8A 'mediawiki':2A 'memori':12A 'right':6A 'semant':1A 'server':9A 'user':3A","search_b":"'caus':62B 'chain':42B 'concept':36B,44B 'cpu':59B 'denial':63B 'edit':53B 'elasticstor':30B 'exhaust':58B 'expand':35B 'fan':46B 'host':23B 'limit':39B 'make':56B 'mediawiki':19B,26B,28B 'memori':61B 'packag':20B 'page':37B,45B,52B 'page-edit':51B 'queri':57B 're':34B 're-expand':33B 'right':54B 'self':22B 'self-host':21B 'semant':25B,27B 'semantic-mediawiki':24B 'servic':65B 'sparqlstor':32B 'user':49B 'without':38B","search_c":"'3.0.0':68C '7.4.1':70C 'action':121C 'acycl':103C 'api.php':120C 'ask':118C,122C 'budget':94C 'build':102C 'chain':104C 'class':83C 'concept':88C,106C,114C 'conceptdescriptioninterpret':82C 'contain':71C 'cpu':124C 'denial':73C 'edit':99C 'elasticstor':79C 'exhaust':123C 'expand':87C 'expans':93C 'fan':109C 'mediawiki':67C 'memoiz':90C 'memori':126C 'page':98C,107C,115C 'page-edit':97C 'queri':112C 're':86C 're-expand':85C 'right':100C 'semant':66C 'servic':75C 'sparqlstor':81C 'special':117C 'user':95C 'via':113C 'view':116C 'vulner':76C 'without':89C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T23:29:46+00:00","kev":null,"cvss_vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-126565","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126565","severity":null,"published_at":"2026-11-11T03:16:50+00:00","modified_at":"2026-11-11T03:16:50+00:00","first_seen_at":"2026-11-11T03:25:00+00:00","fetched_at":"2026-11-11T03:25:00+00:00","note":null}],"documents":[{"id":122039,"url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/86ce13254ffd91406ef43ea403ae072a7e3a38b3","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":122015,"url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.4.1","title":"Release notes: github.com","kind":"release","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release notes: github.com"},{"id":122041,"url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-24v2-mf3g-84ch","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-11-10T23:29:46+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":122042,"url":"https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.4.1-dos-via-exponential-concept-expansion","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}