Vulnerability · Published Oct 27, 2026 · Assigned by VulnCheck
CVE-2026-116871Semantic MediaWiki 3.0.0 before 7.3.1 Uncontrolled Recursion via Special:Ask
High 7.5
In plain English
A high-severity security flaw in SemanticMediaWiki from SemanticMediaWiki. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 67.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SemanticMediaWiki | SemanticMediaWiki | 3.0.0 – before 7.3.1 |
Weakness: CWE-674 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-f8vw-wvm6-h2qq) vendor-advisory
- https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/756492002752f937a9e115e14330b1181bd8c60c patch
- https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/e642f38c708dee7da5e885b8d40be8ffc56f3e87 patch
- VulnCheck Advisory: Semantic MediaWiki 3.0.0 before 7.3.1 Uncontrolled Recursion via Special:Ask third-party-advisory