Race Condition Affecting parse-server package, versions >=9.0.0 <9.10.2-alpha.5>=5.4.0 <8.6.96
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-PARSESERVER-21277857
- published20 Oct 2026
- disclosed13 Oct 2026
- creditUnknown
Introduced: 13 Oct 2026
NewCVE-2026-109954 (opens in a new tab)How to fix?
Upgrade parse-server to version 9.10.2-alpha.5, 8.6.96 or higher.
Overview
parse-server is a version of the Parse backend that can be deployed to any infrastructure that can run Node.js.
Affected versions of this package are vulnerable to Race Condition via createTransactionalSession in DatabaseController.js, where a transactional batch request shares its database session state with other concurrent requests. Because each incoming request reuses a cached DatabaseController rather than receiving a fresh, request-scoped instance, a failing batch transaction can roll back acknowledged writes belonging to other clients, and on PostgreSQL the transaction can remain open indefinitely, causing subsequent writes to block or fail.