{"id":"CVE-2026-126562","kind":"vulnerability","aliases":["CVE-2026-126562"],"related":[],"title":"Semantic MediaWiki: mutually referencing concept pages exhaust PHP memory or stack","description":"Semantic MediaWiki 3.0.0 before 7.4.1 contains an uncontrolled recursion vulnerability in the ElasticStore ConceptDescriptionInterpreter that only detects directly self-referencing concepts. Users with page-edit rights can create mutually referencing concept pages, causing concept page views, Special:Ask, or api.php action=ask queries to exhaust PHP memory or stack.","summary":"Semantic MediaWiki before 7.4.1 fails to detect concept pages that reference each other in a loop when the ElasticStore backend is used. A user who can edit pages can create such a loop, so viewing the concept, running Special:Ask, or calling api.php action=ask makes PHP run out of memory or stack and fail.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["elasticsearch","mediawiki","package","php","semantic-mediawiki"],"not_affected_if":["no-elasticstore","version-7.4.1-or-later"],"how_to_check":null,"fix":"- Semantic MediaWiki: move to `7.4.1` or later.","status":"open","published_at":"2026-11-11T03:16:50+00:00","first_seen_at":"2026-11-11T03:24:59+00:00","triaged_at":"2026-11-11T03:26:32+00:00","updated_at":"2026-11-11T03:26:32+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-11T03:26:32Z","model":"claude-haiku-5-5","output":{"fix":"- Semantic MediaWiki: move to `7.4.1` or later.","reach":"network","title":"Semantic MediaWiki: mutually referencing concept pages exhaust PHP memory or stack","impact":"low","summary":"Semantic MediaWiki before 7.4.1 fails to detect concept pages that reference each other in a loop when the ElasticStore backend is used. A user who can edit pages can create such a loop, so viewing the concept, running Special:Ask, or calling api.php action=ask makes PHP run out of memory or stack and fail.","audience":"businesses","category":"package","nicknames":[],"who_cares":["semantic-mediawiki","mediawiki","php","elasticsearch"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"PHP exhausts memory or stack, crashing wiki page and query requests","analyst_note":"","how_to_check":"- Check the installed Semantic MediaWiki version, for example with `php maintenance/run.php version` or the Special:Version page, and see whether it is in the `3.0.0` to `7.4.0` range.\n- Check whether the wiki uses the ElasticStore backend (the Elasticsearch-based store) in LocalSettings.php.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["version-7.4.1-or-later","no-elasticstore"],"who_is_affected":"Wikis running Semantic MediaWiki from 3.0.0 up to but not including 7.4.1, most relevant where the ElasticStore backend is in use. Exposure requires a user with page-edit rights to create the loop, so wikis that restrict editing to trusted users face less risk. Wikis on 7.4.1 or later are not affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000786,"input_tokens":4672,"output_tokens":638,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-126562':14A,17A '-2026':13A,16A '3.0.0':82C '7.4.1':28B,84C 'action':68B,122C 'api.php':67B,121C 'ask':64B,69B,119C,123C 'backend':44B 'call':66B 'caus':114C 'concept':5A,32B,61B,101C,112C,115C 'conceptdescriptioninterpret':93C 'contain':85C 'creat':54B,109C 'cve':12A,15A 'detect':31B,96C 'direct':97C 'edit':51B,106C 'elasticsearch':18B 'elasticstor':43B,92C 'exhaust':7A,126C 'fail':29B,79B 'loop':40B,57B 'make':70B 'mediawiki':2A,19B,24B,26B,81C 'memori':9A,75B,128C 'mutual':3A,110C 'packag':20B 'page':6A,33B,52B,105C,113C,116C 'page-edit':104C 'php':8A,21B,71B,127C 'queri':124C 'recurs':88C 'refer':35B 'referenc':4A,100C,111C 'right':107C 'run':62B,72B 'self':99C 'self-referenc':98C 'semant':1A,23B,25B,80C 'semantic-mediawiki':22B 'special':63B,118C 'stack':11A,77B,130C 'uncontrol':87C 'use':46B 'user':48B,102C 'view':59B,117C 'vulner':89C","nicknames":[],"mitigations":[],"who_affected":"Wikis running Semantic MediaWiki from 3.0.0 up to but not including 7.4.1, most relevant where the ElasticStore backend is in use. Exposure requires a user with page-edit rights to create the loop, so wikis that restrict editing to trusted users face less risk. Wikis on 7.4.1 or later are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["elasticsearch","mediawiki","medium","package","php","semanticmediawiki"],"campaign_type":null,"search_a":"'-126562':14A,17A '-2026':13A,16A 'concept':5A 'cve':12A,15A 'exhaust':7A 'mediawiki':2A 'memori':9A 'mutual':3A 'page':6A 'php':8A 'referenc':4A 'semant':1A 'stack':11A","search_b":"'7.4.1':28B 'action':68B 'api.php':67B 'ask':64B,69B 'backend':44B 'call':66B 'concept':32B,61B 'creat':54B 'detect':31B 'edit':51B 'elasticsearch':18B 'elasticstor':43B 'fail':29B,79B 'loop':40B,57B 'make':70B 'mediawiki':19B,24B,26B 'memori':75B 'packag':20B 'page':33B,52B 'php':21B,71B 'refer':35B 'run':62B,72B 'semant':23B,25B 'semantic-mediawiki':22B 'special':63B 'stack':77B 'use':46B 'user':48B 'view':59B","search_c":"'3.0.0':82C '7.4.1':84C 'action':122C 'api.php':121C 'ask':119C,123C 'caus':114C 'concept':101C,112C,115C 'conceptdescriptioninterpret':93C 'contain':85C 'creat':109C 'detect':96C 'direct':97C 'edit':106C 'elasticstor':92C 'exhaust':126C 'mediawiki':81C 'memori':128C 'mutual':110C 'page':105C,113C,116C 'page-edit':104C 'php':127C 'queri':124C 'recurs':88C 'referenc':100C,111C 'right':107C 'self':99C 'self-referenc':98C 'semant':80C 'special':118C 'stack':130C 'uncontrol':87C 'user':102C 'view':117C 'vulner':89C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T23:29:44+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-2026-126562","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126562","severity":null,"published_at":"2026-11-11T03:16:50+00:00","modified_at":"2026-11-11T03:16:50+00:00","first_seen_at":"2026-11-11T03:24:59+00:00","fetched_at":"2026-11-11T03:24:59+00:00","note":null}],"documents":[{"id":122026,"url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/35d8f8c9c7b48a476751ca0b795b78b648756828","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":122028,"url":"https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-jwx8-mm92-gv95","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-11-10T23:29:44+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":122029,"url":"https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.4.1-uncontrolled-recursion-via-elasticstore-conceptdescriptioninterpreter","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"}