TI-2026-81075 Aliases CVE-2026-116871 GHSA-p6m4-5726-45x8

Uncontrolled recursion in Semantic MediaWiki via Special:Ask

HIGH 77CWE-674Published 2026-10-27 · Updated 2026-11-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-674.

Summary

Semantic MediaWiki from 3.0.0 before 7.3.1 contains uncontrolled recursion (CWE-674) in LegacyParser::getSubqueryDescription(), which processes nested query tokens before depth limits apply. An unauthenticated remote attacker can submit deeply nested query elements to the action=ask API, consuming substantial CPU and memory and tying up request workers. A public proof-of-concept exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00387 32nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed SemanticMediaWiki (SemanticMediaWiki): 7.3.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
SemanticMediaWiki	SemanticMediaWiki	3.0.0 to before 7.3.1	7.3.1	Patch available	CNA

SemanticMediaWiki VendorSemanticMediaWiki Affected 3.0.0 to before 7.3.1 Fixed in 7.3.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:semantic-mediawiki:semantic_mediawiki::::::mediawiki::*	3.0.0 to before 7.3.1	Vulnerable	SemanticMediaWiki

cpe:2.3:a:semantic-mediawiki:semantic_mediawiki:*:*:*:*:*:mediawiki:*:* Versions 3.0.0 to before 7.3.1 Vulnerable ·SemanticMediaWiki

Remediation

Upgrade SemanticMediaWiki to version 7.3.1 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Fix · CNA SemanticMediaWiki (SemanticMediaWiki) Fixed in 7.3.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-27
SemanticMediaWiki 7.3.1
20 records Highest priority Priority HIGH 4 HIGH, 13 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-81081 Resource exhaustion in Semantic MediaWiki via #set_recurring_eventPriority HIGH 77
- TI-2026-81076 Semantic MediaWiki search lets attackers exhaust CPU via long termsPriority HIGH 77
- TI-2026-81077 Missing authorization in Semantic MediaWiki smwtask APIPriority HIGH 70
Show all 20 records →

Timeline

2026-10-27 Threatist record created from CVE-2026-116871
2026-10-27 Alias added: GHSA-p6m4-5726-45x8
2026-10-28 Priority changed: MEDIUM → LOW
2026-11-04 CISA SSVC decision points changed
2026-11-04 Priority changed: LOW → HIGH

References

Exploit 1

GitHub Security Advisory (GHSA-f8vw-wvm6-h2qq)

Patch 2

TI-2026-81081 Resource exhaustion in Semantic MediaWiki via #set_recurring_event CVSS 4.0HIGH 8.7
TI-2026-81076 Semantic MediaWiki search lets attackers exhaust CPU via long terms CVSS 4.0HIGH 8.7
TI-2026-81077 Missing authorization in Semantic MediaWiki smwtask API CVSS 4.0MEDIUM 6.9
TI-2026-81084 Cross-site request forgery in Semantic MediaWiki SMWAdmin page CVSS 4.0HIGH 7.1
TI-2026-81083 Missing authorization in Semantic MediaWiki smwtask update task CVSS 4.0MEDIUM 6.9
TI-2026-81080 Missing authorization in Semantic MediaWiki lets editors lock pages CVSS 4.0HIGH 7.1

See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences