{"schemaVersion":3,"id":"CVE-2026-15806","aliases":["ALPINE-CVE-2026-15806","UBUNTU-CVE-2026-15806","DEBIAN-CVE-2026-15806","CGA-3gc2-32wj-v3wr","CGA-9pq2-qprm-mfcg","CGA-fq56-2mh9-p386","CGA-g3mh-g37r-xggp","CGA-hrrj-4837-fgpw","CGA-jqx3-7h23-pgh7","CGA-mj45-mv3j-4p86","CGA-mvjp-8w87-f499","CGA-rp5f-mfp4-rg9f","CGA-xcvc-j4jc-2pw3"],"status":"published","duplicateOf":null,"title":null,"description":"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:// 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