{"id":"UBUNTU-CVE-2026-49272","details":"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.","modified":"2026-11-07T01:46:17.442760075Z","published":"2026-11-06T00:00:00Z","upstream":["CVE-2026-49272"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-49272"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-49272"},{"type":"REPORT","url":"https://github.com/oauthlib/oauthlib/security/advisories/GHSA-3jp2-3mrg-2vxc"},{"type":"REPORT","url":"https://github.com/oauthlib/oauthlib/pull/954"},{"type":"REPORT","url":"https://github.com/oauthlib/oauthlib/commit/77a5f1c8ce00da2b0b8c5f6e9cc129920085f114"},{"type":"REPORT","url":"https://github.com/oauthlib/oauthlib/releases/tag/v4.0.1"}],"affected":[{"package":{"name":"python-oauthlib","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-oauthlib?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0-1","1.0.3-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.3-1","binary_name":"python-oauthlib"},{"binary_name":"python3-oauthlib","binary_version":"1.0.3-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49272.json"}},{"package":{"name":"python-oauthlib","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python-oauthlib?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.1-1","2.0.4-1","2.0.6-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-oauthlib","binary_version":"2.0.6-1"},{"binary_version":"2.0.6-1","binary_name":"python3-oauthlib"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49272.json"}},{"package":{"name":"python-oauthlib","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/python-oauthlib?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.0-1","3.1.0-1ubuntu1","3.1.0-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.1.0-1ubuntu2","binary_name":"python3-oauthlib"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49272.json"}},{"package":{"name":"python-oauthlib","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/python-oauthlib?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.0-2","3.1.1-1","3.2.0-1","3.2.0-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-oauthlib","binary_version":"3.2.0-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49272.json"}},{"package":{"name":"python-oauthlib","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/python-oauthlib?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-oauthlib","binary_version":"3.2.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49272.json"}},{"package":{"name":"python-oauthlib","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/python-oauthlib?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.1-1build1","3.3.1-2"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-oauthlib","binary_version":"3.3.1-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49272.json"}},{"package":{"name":"python-oauthlib","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-oauthlib?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.2-3","3.3.1-1","3.3.1-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-oauthlib","binary_version":"3.3.1-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49272.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}