Vulnerability	Vulnerable Version
M Acceptance of Extraneous Untrusted Data With Trusted Data fast-jwt is a Fast JSON Web Token implementation Affected versions of this package are vulnerable to Acceptance of Extraneous Untrusted Data With Trusted Data when validating an issuer (`iss`) claim in `validateClaimValues()`. This function implicitly accepts an array of issuer URLs and accepts it if one member is verified. This behavior is not compliant with RFC 7519, which specifies that a token must be a string. An attacker can bypass the intended verification by sending a JWT whose `iss` claim includes a malicious domain as well as a legitimate one. How to fix Acceptance of Extraneous Untrusted Data With Trusted Data? Upgrade `fast-jwt` to version 5.0.6 or higher.	<5.0.6
M Improper Input Validation fast-jwt is a Fast JSON Web Token implementation Affected versions of this package are vulnerable to Improper Input Validation due to improperly prevention of `JWT` algorithm confusion for all public key types. To exploit this vulnerability, an attacker needs to craft a malicious `JWT` token containing the HS256 algorithm, signed with the public `RSA` key of the victim application. Note: This attack will only work if the victim application utilizes a public key containing the `BEGIN RSA PUBLIC KEY` header. How to fix Improper Input Validation? Upgrade `fast-jwt` to version 3.3.2 or higher.	<3.3.2

Acceptance of Extraneous Untrusted Data With Trusted Data

fast-jwt is a Fast JSON Web Token implementation

Affected versions of this package are vulnerable to Acceptance of Extraneous Untrusted Data With Trusted Data when validating an issuer (iss) claim in validateClaimValues(). This function implicitly accepts an array of issuer URLs and accepts it if one member is verified. This behavior is not compliant with RFC 7519, which specifies that a token must be a string. An attacker can bypass the intended verification by sending a JWT whose iss claim includes a malicious domain as well as a legitimate one.

How to fix Acceptance of Extraneous Untrusted Data With Trusted Data?

Upgrade fast-jwt to version 5.0.6 or higher.

<5.0.6

Improper Input Validation

fast-jwt is a Fast JSON Web Token implementation

Affected versions of this package are vulnerable to Improper Input Validation due to improperly prevention of JWT algorithm confusion for all public key types. To exploit this vulnerability, an attacker needs to craft a malicious JWT token containing the HS256 algorithm, signed with the public RSA key of the victim application.

Note: This attack will only work if the victim application utilizes a public key containing the BEGIN RSA PUBLIC KEY header.

How to fix Improper Input Validation?

Upgrade fast-jwt to version 3.3.2 or higher.

<3.3.2

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