The (1) makenonce, (2) generatenonce, and (3) generate_verifier functions in SimpleGeo python-oauth2 uses weak random numbers to generate nonces, which makes it easier for remote attackers to guess the nonce via a brute force attack.
"https://github.com/pypa/advisory-database/blob/main/vulns/oauth2/PYSEC-2014-86.yaml"