What’s Vulnerable › Vulnerabilities

CVE-2026-39934: Growth Experiments ReassignMenteesJob runs as an infinite loop

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-07 · updated 2026-07-21
• Weakness: CWE-835

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.

Affected products

• The Wikimedia Foundation Mediawiki - GrowthExperiments Extension: before 1.43; 1.45, 1.44, 1.43 — fixed in 1.43

How to fix

Upgrade to a fixed version: The Wikimedia Foundation Mediawiki - GrowthExperiments Extension 1.43. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/c/1243874
• https://phabricator.wikimedia.org/T418222

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