Source: pypy3 X-Debbugs-CC: [email protected] Severity: important Tags: security
Hi, The following vulnerability was published for pypy3. CVE-2026-15806[0]: | 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://. Credential 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. Users 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. https://mail.python.org/archives/list/[email protected]/thread/3OKPE5S75KDNA7FY7AI3PL2MXM2X5RB3/ https://github.com/python/cpython/issues/155694 https://github.com/python/cpython/pull/155696 Fixed by: https://github.com/python/cpython/commit/a7bb524fef61f77ede01f660ffbd591e1d5837ce (main) If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-15806 https://www.cve.org/CVERecord?id=CVE-2026-15806 Please adjust the affected versions in the BTS as needed.
