CVE-2026-116871

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductSemantic-mediawiki Semantic Mediawiki

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-674CWE-674

How to fix

Update

semantic-mediawiki semantic_mediawiki7.3.1 or later

Patches

Vendor advisories

github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-f8vw-wvm6-h2qq

Affected products

Product	Affected versions	Fixed in
semantic-mediawiki semantic_mediawiki	3.0.0 ≤ v < 7.3.1	7.3.1

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