Vulnerability in Semanticmediawiki
CVE-2026-116871
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-f8vw-wv… (vendor-advisory)
- github.com/SemanticMediaWiki/SemanticMediaWiki/commit/756492002752f937a9e115e14… (patch)
- github.com/SemanticMediaWiki/SemanticMediaWiki/commit/e642f38c708dee7da5e885b8d… (patch)
- www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.3.1-uncontrolled… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116871?
- CVE-2026-116871 is a high-severity vulnerability in Semanticmediawiki, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-10-27.
- How severe is CVE-2026-116871?
- High severity. CVSS v3 base score is 7.5 out of 10.