CVE-2026-39934
Received Received - Intake
Infinite Loop and TOCTOU Race in Mediawiki GrowthExperiments Extension

Publication date: 2026-04-07

Last updated on: 2026-04-08

Assigner: wikimedia-foundation

Description
Loop with unreachable exit condition ('infinite loop') vulnerability in The Wikimedia Foundation Mediawiki - GrowthExperiments Extension allows Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions. This issue was remediated only on the `master` branch.
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Meta Information
Published
2026-04-07
Last Modified
2026-04-08
Generated
2026-06-16
AI Q&A
2026-04-08
EPSS Evaluated
2026-06-15
NVD
CVE-2026-39934
EUVD
EUVD-2026-19978
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
the_wikimedia_foundation mediawiki_growthexperiments_extension 1.45.2
the_wikimedia_foundation mediawiki_growthexperiments_extension 1.44.4
the_wikimedia_foundation mediawiki_growthexperiments_extension 1.43.7
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-835 The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
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Executive Summary

This vulnerability is an infinite loop issue caused by a loop with an unreachable exit condition in the Wikimedia Foundation Mediawiki - GrowthExperiments Extension. It involves leveraging Time-of-Check to Time-of-Use (TOCTOU) race conditions, which means that the state of a resource can change between the time it is checked and the time it is used, potentially leading to unexpected behavior.

Impact Analysis

The vulnerability can cause the affected Mediawiki GrowthExperiments Extension to enter an infinite loop, which may lead to denial of service by consuming excessive resources or making the application unresponsive.

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