---
id: CVE-2026-116878
title: >-
  Semantic MediaWiki 2.5.0 before 7.3.1 Resource Exhaustion via
  Special:PropertyLabelSimilarity
summary: >-
  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…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-400
vendor: SemanticMediaWiki
product: SemanticMediaWiki
affected:
  - SemanticMediaWiki >= 2.5.0 < 7.3.1
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-27T13:46:20.630387Z'
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T14:13:22.135Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116878'
references:
  - url: >-
      https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-wh64-r5x2-vjgf
    label: GitHub Security Advisory (GHSA-wh64-r5x2-vjgf)
  - url: >-
      https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/15ed8489a4ca142ea5417d0c4403dbbe0a3ee3f5
  - url: >-
      https://www.vulncheck.com/advisories/semantic-mediawiki-2.5.0-before-7.3.1-resource-exhaustion-via-special-propertylabelsimilarity
    label: >-
      VulnCheck Advisory: Semantic MediaWiki 2.5.0 before 7.3.1 Resource
      Exhaustion via Special:PropertyLabelSimilarity
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.446Z'
---

## Overview

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.

## Affected

- `SemanticMediaWiki >= 2.5.0 < 7.3.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.