CVE-2021-40839

    Dashboard / Vulnerabilities / CVE-2021-40839

    CVE-2021-40839

    Published: 10 Sept 2021Last Modified: 8 Jul 2026

    Summary:

    Details: The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\x2f\x7f), enabling a remote attack that consumes CPU and memory.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMVQRPDVSVZNGGX57CFKCYT3DEYO4QB6/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MCLETLGVM5DBX6QNHQFW6TWGO5T3DENY/, https://pypi.org/project/rencode/#history, https://seclists.org/fulldisclosure/2021/Sep/16, https://security.netapp.com/advisory/ntap-20211008-0001/, https://github.com/aresch/rencode/commit/572ff74586d9b1daab904c6f7f7009ce0143bb75, https://github.com/aresch/rencode/pull/29

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v1.0.6
    v1.0.5
    v1.0.4
    v1.0.3
    v1.0

    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
    CVE-2021-40839 | CVE-DB