Vulnerability Description
The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/commit/482d6f8bdba9da3725d272e8bb4a2d25fb6a603
- https://github.com/python/cpython/commit/69ddd9bb2cc4bd69b1565647c18659c6a789ccd
- https://github.com/python/cpython/commit/876858c9f65d9ab656c7fa639f268ce7856d89d
- https://github.com/python/cpython/commit/a51b1b512de1d56b3714b65628a2eae2b07e535
- https://github.com/python/cpython/commit/e58e9802b9bec5cdbf48fc9bf1da5f4fda482e8
- https://github.com/python/cpython/issues/145506
- https://github.com/python/cpython/pull/145507
- http://www.openwall.com/lists/oss-security/2026/03/05/6
FAQ
What is CVE-2026-2297?
CVE-2026-2297 is a documented vulnerability. The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.aud...
How severe is CVE-2026-2297?
CVSS scoring is not yet available for CVE-2026-2297. Check NVD for updates.
Is there a patch for CVE-2026-2297?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.