UBUNTU-CVE-2026-84185

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    UBUNTU-CVE-2026-84185

    Published: 3 Sept 2026Last Modified: 16 Sept 2026
    Upstream:
    CVE-2026-84185

    Summary:

    Details: A flaw was found in the jwcrypto library, which is used for implementing Javascript Object Signing and Encryption (JOSE) standards. The issue occurs when the library verifies a General JSON Serialization JWS using a set of keys. Due to a coding error, the library fails to correctly identify the specific key ID (kid) and may instead accept a signature made by any valid key in the set. This can allow an attacker with a valid key to bypass authorization checks in applications that rely on the key ID to identify specific tenants or users.

    References: https://ubuntu.com/security/CVE-2026-84185, https://www.cve.org/CVERecord?id=CVE-2026-84185, https://bugzilla.redhat.com/show_bug.cgi?id=2526729, https://access.redhat.com/security/cve/CVE-2026-84185

    Affected packages

    Package

    Name: python-jwcrypto

    Purl: pkg:deb/ubuntu/python-jwcrypto?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    0.2.1-1

    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-2026-84185 | CVE-DB