{"cve":"CVE-2020-26244","nvd":{"published":"2020-12-02T20:15:13.430","modified":"2026-06-17T03:07:54.433","status":"Modified","description":"Python oic is a Python OpenID Connect implementation. In Python oic before version 1.2.1, there are several related cryptographic issues affecting client implementations that use the library. The issues are: 1) The IdToken signature algorithm was not checked automatically, but only if the expected algorithm was passed in as a kwarg. 2) JWA `none` algorithm was allowed in all flows. 3) oic.consumer.Consumer.parse_authz returns an unverified IdToken. The verification of the token was left to the discretion of the implementator. 4) iat claim was not checked for sanity (i.e. it could be in the future). These issues are patched in version 1.2.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","score":6.8},"cwes":["CWE-347","CWE-325"],"references":["https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498","https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1","https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfg","https://pypi.org/project/oic/","https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498"],"products":["python_openid_connect_project:python_openid_connect"],"source":"nvd","synced_at":"2026-10-19T21:11:20.317016139+00:00"},"epss":{"cve":"CVE-2020-26244","score":0.00832,"percentile":0.57639,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-4fjv-pmhg-3rfg","url":"https://osv.dev/vulnerability/GHSA-4fjv-pmhg-3rfg","summary":"Multiple cryptographic issues in Python oic","modified":"2026-07-08T05:59:40.468770443Z","packages":[{"ecosystem":"PyPI","name":"oic","purl":"pkg:pypi/oic","ranges":["<1.2.1"],"fixed":["1.2.1"]}]},{"id":"PYSEC-2020-69","url":"https://osv.dev/vulnerability/PYSEC-2020-69","summary":"","modified":"2023-11-08T04:03:15.948349Z","packages":[{"ecosystem":"PyPI","name":"oic","purl":"pkg:pypi/oic","ranges":["<1.2.1"],"fixed":["1.2.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}