Semantic MediaWiki 3.0.0 before 7.3.1 Uncontrolled Recursion via Special:Ask

{
  "id": "218e50ad3eed514f2d603f39650be88949d2073d6462d1b336fdae6e95c91a5c",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116871",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Semantic MediaWiki 3.0.0 before 7.3.1 Uncontrolled Recursion via Special:Ask",
    "summary": "Semantic MediaWiki 3.0.0 before 7.3.1 contains an uncontrolled recursion vulnerability in LegacyParser::getSubqueryDescription() that processes nested query tokens before depth limits apply. Unauthenticated attackers can submit deeply nested query elements to the action=ask API to consume substantial CPU and memory, tying up request workers.",
    "evidence": "cve:CVE-2026-116871",
    "products": [
      {
        "name": {
          "value": "SemanticMediaWiki",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-116871",
      "aliases": [
        "CVE-2026-116871"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 8.7,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE"
          }
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 7.5,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "vendor": "SemanticMediaWiki",
          "product": "SemanticMediaWiki",
          "versions": [
            {
              "status": "affected",
              "version": "3.0.0",
              "lessThan": "7.3.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.3.1",
              "versionType": "semver"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-27T10:26:38.191Z",
      "provider": "cve",
      "references": [
        "https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-f8vw-wvm6-h2qq",
        "https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/756492002752f937a9e115e14330b1181bd8c60c",
        "https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/e642f38c708dee7da5e885b8d40be8ffc56f3e87",
        "https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.3.1-uncontrolled-recursion-via-special-ask"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
          "shortName": "VulnCheck",
          "dateUpdated": "2026-10-27T10:26:38.191Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116871",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 391806,
  "published_at": "2026-10-27T10:23:26.29+00:00"
}