PYSEC-2021-13

    Dashboard / Vulnerabilities / PYSEC-2021-13

    PYSEC-2021-13

    Published: 13 May 2021Last Modified: 9 Oct 2025

    Summary:

    Details: 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.

    References: https://github.com/sh4nks/flask-caching/pull/209, https://github.com/advisories/GHSA-656c-6cxf-hvcv

    Affected packages

    Package

    Name: flask-caching

    Purl: pkg:pypi/flask-caching

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 1.0.0
    Fixed -None

    Affected versions

    1.0.0
    1.0.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    PYSEC-2021-13 | CVE-DB