GHSA-qwph-4952-7xr6

# Overview

In versions <=8.5.1 of jsonwebtoken library, lack of algorithm definition and a falsy secret or key in the `jwt.verify()` function can lead to signature validation bypass due to defaulting to the `none` algorithm for signature verification.

# Am I affected? You will be affected if all the following are true in the `jwt.verify()` function: - a token with no signature is received - no algorithms are specified - a falsy (e.g. null, false, undefined) secret or key is passed

# How do I fix it? Update to version 9.0.0 which removes the default support for the none algorithm in the `jwt.verify()` method.

# Will the fix impact my users?

There will be no impact, if you update to version 9.0.0 and you don’t need to allow for the `none` algorithm. If you need 'none' algorithm, you have to explicitly specify that in `jwt.verify()` options.