The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code. NOTE: a third party indicates that exploitation is extremely unlikely unless the machine is already compromised; in other cases, the attacker would be unable to write their payload to the cache and generate the required collision
History

Wed, 25 Feb 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-05-13T22:51:20.000Z

Updated: 2024-08-03T23:42:19.075Z

Reserved: 2021-05-13T00:00:00.000Z

Link: CVE-2021-33026

cve-icon Vulnrichment

Updated: 2024-08-03T23:42:19.075Z

cve-icon NVD

Status : Modified

Published: 2021-05-13T23:15:07.367

Modified: 2024-11-21T06:08:09.140

Link: CVE-2021-33026

cve-icon Redhat

No data.