CVE-2026-116878
Semantic MediaWiki 2.5.0 before 7.3.1 Resource Exhaustion via Special:PropertyLabelSimilarity
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | semanticmediawiki |
| Product | semanticmediawiki |
| Published | Oct 27, 2026 |
| Last Updated | Oct 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
SemanticMediaWiki / SemanticMediaWiki
2.5.0 < 7.3.1
References
github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-wh64-r5x2-vjgf github.com: https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/15ed8489a4ca142ea5417d0c4403dbbe0a3ee3f5 vulncheck.com: https://www.vulncheck.com/advisories/semantic-mediawiki-2.5.0-before-7.3.1-resource-exhaustion-via-special-propertylabelsimilarity
Credits
AlpetGexha