---
title: "CVE-2026-116871: Semantic MediaWiki - Denial of Service"
description: "Semantic MediaWiki < 7.3.1 contains a denial of service caused by uncontrolled recursion in LegacyParser::getSubqueryDescription processing nested query tokens before depth limits, letting unauthenticated attackers exhaust CPU and memory via action=ask API."
url: https://panop.io/threat-heartbeat/CVE-2026-116871/
---

# CVE-2026-116871 Semantic MediaWiki - Denial of Service

Semantic MediaWiki < 7.3.1 contains a denial of service caused by uncontrolled recursion in LegacyParser::getSubqueryDescription processing nested query tokens before depth limits, letting unauthenticated attackers exhaust CPU and memory via action=ask API.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.37% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-116871)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

27 October 2026

Updated

29 October 2026

Weakness

[CWE-674](https://cwe.mitre.org/data/definitions/674.html)

## Vendor fix

Upgrade to version 7.3.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-116871](https://nvd.nist.gov/vuln/detail/CVE-2026-116871)
- [https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/756492002752f937a9e115e14330b1181bd8c60c](https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/756492002752f937a9e115e14330b1181bd8c60c)
- [https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/e642f38c708dee7da5e885b8d40be8ffc56f3e87](https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/e642f38c708dee7da5e885b8d40be8ffc56f3e87)
- [https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-f8vw-wvm6-h2qq](https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-f8vw-wvm6-h2qq)
- [https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.3.1-uncontrolled-recursion-via-special-ask](https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.3.1-uncontrolled-recursion-via-special-ask)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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