UBUNTU-CVE-2025-61152

    Dashboard / Vulnerabilities / UBUNTU-CVE-2025-61152

    UBUNTU-CVE-2025-61152

    Published: 10 Oct 2025Last Modified: 5 Dec 2025
    Upstream:
    CVE-2025-61152

    Summary:

    Details: python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library. NOTE: all parties agree that the issue is not relevant because it only occurs in a "verify_signature": False situation.

    References: https://ubuntu.com/security/CVE-2025-61152, https://www.cve.org/CVERecord?id=CVE-2025-61152, https://github.com/javiermorales36/PoC-for-python-jose-alg-none-JWT-bypass-vulnerability/blob/main/CVE-2025-61152_Security_Advisory.md, https://pypi.org/project/python-jose

    Affected packages

    Package

    Name: python-jose

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-1?arch=source&distro=jammy

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.3.0+dfsg-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
    UBUNTU-CVE-2025-61152 | CVE-DB