{"action":"Upgrade urllib3 to 1.26.4 or later.","affected":[{"fixed":"1.26.4","introduced":"1.26.0"}],"component":"urllib3","cve_ids":["CVE-2021-28363"],"ecosystem":"PyPI","epss":0.02166,"exploited":false,"fixed_versions":["1.26.4"],"ghsa_id":"GHSA-5phf-pp7p-vc2r","id":"tcs_01M5KF1FHCMJ47ME5N1DC4346N","modified_at":"2026-07-08T06:28:26.820684687Z","published_at":"2021-03-19T19:42:11Z","references":["https://osv.dev/vulnerability/GHSA-5phf-pp7p-vc2r","https://github.com/urllib3/urllib3/security/advisories/GHSA-5phf-pp7p-vc2r","https://nvd.nist.gov/vuln/detail/CVE-2021-28363","https://github.com/urllib3/urllib3/commit/8d65ea1ecf6e2cdc27d42124e587c1b83a3118b0","https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2021-59.yaml","https://github.com/pypa/advisory-db/tree/main/vulns/urllib3/PYSEC-2021-59.yaml","https://github.com/urllib3/urllib3","https://github.com/urllib3/urllib3/blob/main/CHANGES.rst#1264-2021-03-15","https://github.com/urllib3/urllib3/commits/main","https://github.com/urllib3/urllib3/releases/tag/1.26.4","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL","https://pypi.org/project/urllib3/1.26.4","https://security.gentoo.org/glsa/202107-36","https://security.gentoo.org/glsa/202305-02","https://security.netapp.com/advisory/ntap-20240621-0007","https://www.oracle.com/security-alerts/cpuoct2021.html"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"GHSA-5phf-pp7p-vc2r","url":"https://osv.dev/vulnerability/GHSA-5phf-pp7p-vc2r"}],"summary":"Using default SSLContext for HTTPS requests in an HTTPS proxy doesn't verify certificate hostname for proxy connection"}