{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.0.0"
                  },
                  {
                    "fixed": "7.4.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "range": [
                  {
                    "fixed": "86ce13254ffd91406ef43ea403ae072a7e3a38b3"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "7.4.1",
                "range": [
                  {
                    "fixed": "bcc3cbf4884f0474232a68d3eff060f93a506379"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "abdec882fc57dd5b54cab15e8f419056164ee66a"
            },
            {
              "fixed": "bcc3cbf4884f0474232a68d3eff060f93a506379"
            },
            {
              "fixed": "86ce13254ffd91406ef43ea403ae072a7e3a38b3"
            }
          ],
          "repo": "https://github.com/semanticmediawiki/semanticmediawiki",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-24v2-mf3g-84ch"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126565.json"
  },
  "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.",
  "id": "CVE-2026-126565",
  "modified": "2026-11-12T02:30:30.738328751Z",
  "published": "2026-11-11T02:36:00.573Z",
  "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"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Semantic MediaWiki 3.0.0 before 7.4.1 DoS via Exponential Concept Expansion"
}