Hi,

The following vulnerability was published for python-oauthlib.

CVE-2026-49272[0]:
| OAuthLib is an implementation of the OAuth request-signing logic for
| Python 3.6+. From 3.3.0 until 4.0.1, OAuthLib's RFC 8628 device
| workflow does not require DeviceCodeGrant.validate_token_request to
| check that the device_code parameter is present and valid. A caller
| whose client request is accepted by the configured validator and who
| knows a valid client ID enabled for the device workflow can submit a
| missing or bogus device code to the token endpoint and obtain a
| bearer token without completing device authorization. This issue is
| fixed in version 4.0.1.

https://github.com/oauthlib/oauthlib/security/advisories/GHSA-3jp2-3mrg-2vxc
https://github.com/oauthlib/oauthlib/pull/954

Fixed by: https://github.com/oauthlib/oauthlib/commit/77a5f1c8ce00da2b0b8c5f6e9cc129920085f114 (v4.0.1)


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-49272
https://www.cve.org/CVERecord?id=CVE-2026-49272

Please adjust the affected versions in the BTS as needed.