CVE-2021-23727: Celeryproject Celery

High severity, CVSS 7.5. EPSS: 3.9% chance of exploitation in the next 30 days.

This affects the package celery before 5.2.2. It by default trusts the messages and metadata stored in backends (result stores). When reading task metadata from the backend, the data is deserialized. Given that an attacker can gain access to, or somehow manipulate the metadata within a celery backend, they could trigger a stored command injection vulnerability and potentially gain further access to the system.

Affected products

• Celeryproject Celery: before 5.2.2 (fixed in 5.2.2)
• Fedoraproject Extra Packages For Enterprise Linux: version 7.0 only
• Fedoraproject Fedora: version 35 only

Published 2021-12-29. Last modified 2026-06-17.