{"id":"GHSA-4fjv-pmhg-3rfg","summary":"Multiple cryptographic issues in Python oic","details":"### Impact\n* Client implementations using this library\n\n### Issues\n1) The IdToken signature algorithm was not checked automatically, but only if the expected algorithm was passed in as a kwarg.\n2) JWA `none` algorithm was allowed in all flows.\n3) `oic.consumer.Consumer.parse_authz` returns an unverified IdToken. The verification of the token was left to the discretion of the implementator.\n4) `iat` claim was not checked for sanity (i.e. it could be in the future)\n\n### Patches\n1) IdToken signature is now always checked.\n2) JWA `none` algorithm is now allowed only if using the `response_type` `code`\n3) IdToken verification is now done automatically.\n4) `iat` claim is now checked for sanity.","aliases":["CVE-2020-26244","PYSEC-2020-69"],"modified":"2026-05-07T05:02:26.232835210Z","published":"2020-12-04T16:47:12Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-325","CWE-347"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2020-12-02T20:06:06Z"},"references":[{"type":"WEB","url":"https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26244"},{"type":"WEB","url":"https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498"},{"type":"PACKAGE","url":"https://github.com/OpenIDC/pyoidc"},{"type":"WEB","url":"https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/oic/PYSEC-2020-69.yaml"},{"type":"WEB","url":"https://pypi.org/project/oic"}],"affected":[{"package":{"name":"oic","ecosystem":"PyPI","purl":"pkg:pypi/oic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.1"}]}],"versions":["0.10.0.0","0.11.0.0","0.11.0.1","0.12.0","0.13.0","0.13.1","0.14.0","0.15.0","0.15.1","0.4.0","0.5.0","0.6.0","0.7.0","0.7.2","0.7.3","0.7.4","0.7.5","0.7.6","0.7.7","0.7.8","0.8.1","0.8.2","0.8.3","0.8.4.0","0.8.5.0","0.9.0.0","0.9.1.0","0.9.4.0","0.9.5.0","1.0.0","1.0.1","1.1.0","1.1.1","1.1.2","1.2.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/12/GHSA-4fjv-pmhg-3rfg/GHSA-4fjv-pmhg-3rfg.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}]}