CVE-2024-3220Default mimetype known files writeable on Windows
Updated under an hour ago ()
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It affects Python Software Foundation CPython. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 2.3 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-426
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- PSF
- NVD analysis
- Deferred
- Record last updated
- Oct 17, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Python Software Foundation CPython python_software_foundation:cpython (from the name) | before 3.16.0 | CNA record |
References
- https://mail.python.org/archives/list/security-announce@python.org/thread/CDXW34ND2LSAOYAR5N6UNONP4ZBX4D6R/vendor-advisory
- https://github.com/python/cpython/issues/159428issue-tracking
- https://github.com/python/cpython/commit/04a29bf8f9ff8526cd96cb7368400173303a390apatch
- https://github.com/python/cpython/commit/5550519259656cbb8eeac09e3dbc0d5c248a4deapatch
- https://github.com/python/cpython/commit/76f4555c4ff10f5dda58d6528c17787df41e256cpatch
- http://www.openwall.com/lists/oss-security/2025/02/14/8
- https://security.netapp.com/advisory/ntap-20250314-0001/
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.