---
id: CVE-2026-39934
title: >-
  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
summary: >-
  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 …
severity: none
cwe:
  - CWE-835
published: '2026-04-07'
updated: '2026-07-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-39934'
references:
  - url: 'https://gerrit.wikimedia.org/r/c/1243874'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
  - url: 'https://phabricator.wikimedia.org/T418222'
    label: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
tags:
  - nvd
epss: 0.00432
epssPercentile: 0.34889
ingestedAt: '2026-07-22T07:59:32.533Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.