CVE-2026-2297

Summary

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.

Affected Software

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/03/05/6

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/python/cpython/issues/145506
• https://github.com/python/cpython/pull/145507
• https://github.com/python/cpython/commit/482d6f8bdba9da3725d272e8bb4a2d25fb6a603e
• https://github.com/python/cpython/commit/a51b1b512de1d56b3714b65628a2eae2b07e535e
• https://github.com/python/cpython/commit/e58e9802b9bec5cdbf48fc9bf1da5f4fda482e86
• https://github.com/python/cpython/commit/69ddd9bb2cc4bd69b1565647c18659c6a789ccd9
• https://github.com/python/cpython/commit/876858c9f65d9ab656c7fa639f268ce7856d89dd

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