CVE-2026-39934: The Wikimedia Foundation Mediawiki - Growthexperiments Extension

Medium severity, CVSS 6.9. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• The Wikimedia Foundation Mediawiki - Growthexperiments Extension: version 1.45 only; version 1.44 only; version 1.43 only; before 1.43 (fixed in 1.43)

Published 2026-04-07. Last modified 2026-07-21.