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    2 vulnerabilities by Keats

    CVE-2026-25537 (GCVE-0-2026-25537)

    Vulnerability from nvd – Published: 2026-02-04 21:31 – Updated: 2026-02-05 20:52
    VLAI
    Title
    jsonwebtoken has Type Confusion that leads to potential authorization bypass
    Summary
    jsonwebtoken is a JWT lib in rust. Prior to version 10.3.0, there is a Type Confusion vulnerability in jsonwebtoken, specifically, in its claim validation logic. When a standard claim (such as nbf or exp) is provided with an incorrect JSON type (Like a String instead of a Number), the library’s internal parsing mechanism marks the claim as “FailedToParse”. Crucially, the validation logic treats this “FailedToParse” state identically to “NotPresent”. This means that if a check is enabled (like: validate_nbf = true), but the claim is not explicitly marked as required in required_spec_claims, the library will skip the validation check entirely for the malformed claim, treating it as if it were not there. This allows attackers to bypass critical time-based security restrictions (like “Not Before” checks) and commit potential authentication and authorization bypasses. This issue has been patched in version 10.3.0.
    Severity
    5.5 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Keats jsonwebtoken Affected: < 10.3.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-25537 (GCVE-0-2026-25537)

    Vulnerability from cvelistv5 – Published: 2026-02-04 21:31 – Updated: 2026-02-05 20:52
    VLAI
    Title
    jsonwebtoken has Type Confusion that leads to potential authorization bypass
    Summary
    jsonwebtoken is a JWT lib in rust. Prior to version 10.3.0, there is a Type Confusion vulnerability in jsonwebtoken, specifically, in its claim validation logic. When a standard claim (such as nbf or exp) is provided with an incorrect JSON type (Like a String instead of a Number), the library’s internal parsing mechanism marks the claim as “FailedToParse”. Crucially, the validation logic treats this “FailedToParse” state identically to “NotPresent”. This means that if a check is enabled (like: validate_nbf = true), but the claim is not explicitly marked as required in required_spec_claims, the library will skip the validation check entirely for the malformed claim, treating it as if it were not there. This allows attackers to bypass critical time-based security restrictions (like “Not Before” checks) and commit potential authentication and authorization bypasses. This issue has been patched in version 10.3.0.
    Severity
    5.5 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
    Assigner
    References
    Impacted products
    Vendor Product Version
    Keats jsonwebtoken Affected: < 10.3.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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