CVE catalog

CVE-2021-23727

celery: CVE-2021-23727

Severity: High · CVSS 8CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Published: Dec 29, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 3.60% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	celery	sid	`5.6.3-4`	fixed
Debian	celery	forky	`5.6.3-4`	fixed
Debian	celery	trixie	`5.5.2-2`	fixed
Debian	celery	bookworm	`5.2.6-5`	fixed
Ubuntu	celery	14.04	`2.5.3-4ubuntu1`	vulnerable
Ubuntu	celery	14.04	`3.1.6-1ubuntu1`	vulnerable
Ubuntu	celery	16.04	`3.1.18-1ubuntu1`	vulnerable
Ubuntu	celery	16.04	`3.1.20-1`	vulnerable
Ubuntu	celery	18.04	`4.0.2-0ubuntu1`	vulnerable
Ubuntu	celery	18.04	`4.1.0-2ubuntu1`	vulnerable
Ubuntu	celery	20.04	`4.2.1-5fakesync1`	vulnerable
Ubuntu	celery	20.04	`4.2.1-5ubuntu1`	vulnerable
Ubuntu	celery	24.04	`5.3.1-1`	vulnerable
Ubuntu	celery	24.04	`5.3.4-1`	vulnerable
Ubuntu	celery	24.04	`5.3.6-1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	celery	source	sid	`5.2.3-1`	not yet assigned	Not reported	Not reported
Debian	celery	source	forky	`5.2.3-1`	not yet assigned	Not reported	Not reported
Debian	celery	source	trixie	`5.2.3-1`	not yet assigned	Not reported	Not reported
Debian	celery	source	bookworm	`5.2.3-1`	not yet assigned	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[celery]Fixed
Details (2)
- 5.2.6-5 · all · bookworm
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · bookworm; dsa · celery · debian · 12
- 5.2.6-5 · all · bookworm
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · bookworm; dsa · celery · debian · 12
[python3-celery]Fixed
Source package: [celery]
Details (2)
- 5.2.6-5 · all · bookworm
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · bookworm; dsa · celery · debian · 12
- 5.2.6-5 · all · bookworm
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · bookworm; dsa · celery · debian · 12
[python-celery-common]Fixed
Source package: [celery]
Details (2)
- 5.2.6-5 · all · bookworm
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · bookworm; dsa · celery · debian · 12
- 5.2.6-5 · all · bookworm
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · bookworm; dsa · celery · debian · 12
[python-celery-doc]Fixed
Source package: [celery]
Details (2)
- 5.2.6-5 · all · bookworm
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · bookworm; dsa · celery · debian · 12
- 5.2.6-5 · all · bookworm
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · bookworm; dsa · celery · debian · 12

[Debian 13 (Trixie)]

[celery]Fixed
Details (2)
- 5.5.2-2 · all · trixie
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · 13
- 5.5.2-2 · all · trixie
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · 13
[python3-celery]Fixed
Source package: [celery]
Details (2)
- 5.5.2-2 · all · trixie
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · 13
- 5.5.2-2 · all · trixie
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · 13
[python-celery-doc]Fixed
Source package: [celery]
Details (2)
- 5.5.2-2 · all · trixie
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · 13
- 5.5.2-2 · all · trixie
  Fixed · Fixed: 5.2.3-1
  dsa · celery · debian · 13

Observed: Oct 23, 2026, 5:54:54 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]