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    CVE-2026-101917

    PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.

    Published:Sep 28, 2026
    Last Modified:Oct 7, 2026
    EPS:Sep 28, 2026
    EPSS Score:0.00354
    CVSS Score:5.3

    Affected Products

    Vendor
    Jpadilla
    Product
    Pyjwt
    Vendor
    Pyjwt Project
    Product
    Pyjwt

    Exploits

    https://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85qhttps://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85q

    Related CVEs

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    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