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USN-3407-1: PyJWT vulnerability

30 August 2017

PyJWT could be made to crash if it received specially crafted input.



  • pyjwt - Python implementation of JSON Web Token


It was discovered that a vulnerability in PyJWT doesn't check
invalid_strings properly for some public keys. A remote attacker
could take advantage of a key confusion to craft JWTs from scratch.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 17.04
Ubuntu 16.04

In general, a standard system update will make all the necessary changes.