CVE-2026-116878
CVE-2026-116878 · Semantic MediaWiki 2.5.0 before 7.3.1 Resource Exhaustion via Special:PropertyLabelSimilarity
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Semantic MediaWiki from 2.5.0 before 7.3.1 contains an uncontrolled resource consumption vulnerability that allows anonymous attackers to force quadratic computation by supplying a zero limit to Special:PropertyLabelSimilarity. Attackers can send repeated requests with limit=0 to bypass the SQL LIMIT and trigger pairwise similar_text() comparisons, exhausting PHP CPU, memory, and database connections.
CVSS 8.7 · High · Fix available
- Published
- Updated
Affected products and versions
semanticmediawiki
- Versions
- ≥ 2.5.0, < 7.3.1: Affected (semver)
- 7.3.1: Not affected (semver)
Update to 7.3.1
Original sources
- https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-wh64-r5x2-vjgf
- https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/15ed8489a4ca142ea5417d0c4403dbbe0a3ee3f5
- https://www.vulncheck.com/advisories/semantic-mediawiki-2.5.0-before-7.3.1-resource-exhaustion-via-special-propertylabelsimilarity
- https://nvd.nist.gov/vuln/detail/CVE-2026-116878