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CVE-2026-126565— Semantic MediaWiki 3.0.0 before 7.4.1 DoS via Exponential Concept Expansion

Quick assessment

Affected
SemanticMediaWiki SemanticMediaWiki
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Semantic MediaWiki 3.0.0 至 7.4.1 之前的版本中，ElasticStore 和 SPARQLStore 的 ConceptDescriptionInterpreter 类存在拒绝服务漏洞。这些类在重新展开概念时未采用记忆化（memoization）机制，也未设置展开预算限制。拥有页面编辑权限的用户可以构建呈扇形展开的非循环概念（Concept:）页面链，导致通过概念页面查看、Special:Ask 或 api.php?action=ask 发起的查询耗尽 CPU 和内存资源。

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-126565

Vulnerability Information
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Vulnerability Title
Semantic MediaWiki 3.0.0 before 7.4.1 DoS via Exponential Concept Expansion
Source: CVE Program / CVE List V5
Vulnerability Description
Semantic MediaWiki 3.0.0 before 7.4.1 contains a denial of service vulnerability in the ElasticStore and SPARQLStore ConceptDescriptionInterpreter classes, which re-expand concepts without memoization or an expansion budget. Users with page-edit rights can build acyclic chains of Concept: pages that fan out, so queries via concept page views, Special:Ask, or api.php action=ask exhaust CPU and memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SemanticMediaWiki SemanticMediaWiki 3.0.0 ~ 7.4.1 -

II. Public POCs for CVE-2026-126565

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III. Intelligence Information for CVE-2026-126565

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Other References for CVE-2026-126565 (6)

Same Patch Batch · SemanticMediaWiki · 2026-11-11 · 9 CVEs total

CVE-2026-126566 7.1 HIGH Semantic MediaWiki 7.3.1 before 7.4.1 Incorrect Authorization via Edit Protection Annotati
CVE-2026-126561 7.1 HIGH Semantic MediaWiki 2.5.0 before 7.4.1 Missing Authorization via Is edit protected Annotati
CVE-2026-126563 6.1 MEDIUM Semantic MediaWiki 2.4.0 before 7.4.1 Reflected XSS via Special:Ask Date Format
CVE-2026-126560 5.4 MEDIUM Semantic MediaWiki 3.0.0 before 7.4.1 Stored XSS via data-search Attributes
CVE-2026-126567 5.4 MEDIUM Semantic MediaWiki 3.0.0 before 7.4.1 Stored XSS via Special:Ask Debug Output
CVE-2026-126564 5.4 MEDIUM Semantic MediaWiki 2.5.0 before 7.4.1 Stored XSS via Special:Browse Factbox Title
CVE-2026-126559 4.8 MEDIUM Semantic MediaWiki 4.2.0 before 7.4.1 Stored XSS via Special:FacetedSearch
CVE-2026-126562 4.3 MEDIUM Semantic MediaWiki 3.0.0 before 7.4.1 Uncontrolled Recursion via ElasticStore ConceptDescr

IV. Related Vulnerabilities

Same product: SemanticMediaWiki
Same vendor: SemanticMediaWiki
Same weakness: CWE-407