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February 2025

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[CVE-2025-1795] Mishandling of comma during folding and unicode-encoding of email headers
by Seth Larson Feb. 28, 2025

Feb. 28, 2025

There is a LOW severity vulnerability affecting CPython. During an address list folding when a separating comma ends up on a folded line and that line is to be unicode-encoded then the separator itself is also unicode-encoded. Expected behavior is that the separating comma remains a plan comma. This can result in the address header being misinterpreted by some mail servers. Please see the linked CVE ID for the latest information on affected versions: CVE: https://www.cve.org/CVERecord?id=CVE-2025-1795 Issue: https://github.com/python/cpython/issues/100884 Pull requests: https://github.com/python/cpython/pull/100885 and https://github.com/python/cpython/pull/119099

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[CVE-2024-3220] Default mimetype known files writeable on Windows
by Seth Larson Feb. 14, 2025

Feb. 14, 2025

There is a LOW severity vulnerability affecting CPython. There is a defect in the CPython standard library module “mimetypes” where on Windows the default list of known file locations are writable meaning other users can create invalid files to cause MemoryError to be raised on Python runtime startup or have file extensions be interpreted as the incorrect file type. This defect is caused by the default locations of Linux and macOS platforms (such as “/etc/mime.types”) also being used on Windows, where they are user-writable locations (“C:\etc\mime.types”). To work-around this issue a user can call mimetypes.init() with an empty list (“[]”) on Windows platforms to avoid using the default list of known file locations. There is no patch available yet, the CVE will be updated once there is a fixed version. Please see the linked CVE ID for the latest information on affected versions: https://www.cve.org/CVERecord?id=CVE-2024-3220

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