{"id":"AZL-96867","summary":"CVE-2026-15806 affecting package python3 3.12.9-14","details":"The HTTPPasswordMgr class in the urllib.request module, along with its subclasses HTTPPasswordMgrWithDefaultRealm and HTTPPasswordMgrWithPriorAuth, did not take the URL scheme into account when matching stored credentials against a requested URL. Credentials added for an https:// URL were also used for requests to the same host over http://, so an attacker able to redirect or downgrade a client to plain HTTP (for example, via an HTTPS-to-HTTP redirect or an on-path position) could capture credentials in cleartext. Credentials added for http:// URLs could likewise be sent over https://.\n\nCredential matching is now scoped by URL scheme. Credentials registered with a URL that includes a scheme are only used for requests with the same scheme. Credentials registered with a bare authority (such as example.com or example.com:8080) continue to match any scheme, preserving compatibility with existing code, including proxy authentication.\n\nUsers who cannot upgrade immediately can mitigate by ensuring that applications never make plain http:// requests to hosts for which credentials are registered, for example by not following redirects to http:// URLs.","modified":"2026-08-30T05:26:50Z","published":"2026-08-18T16:17:02Z","upstream":["CVE-2026-15806"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15806"}],"affected":[{"package":{"name":"python3","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/python3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.12.9-14"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-96867.json"}}],"schema_version":"1.9.0"}