CVE-2026-2297

medium

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.

References

https://github.com/python/cpython/pull/145507

https://github.com/python/cpython/issues/145506

https://github.com/python/cpython/commit/e58e9802b9bec5cdbf48fc9bf1da5f4fda482e86

https://github.com/python/cpython/commit/a51b1b512de1d56b3714b65628a2eae2b07e535e

https://github.com/python/cpython/commit/876858c9f65d9ab656c7fa639f268ce7856d89dd

https://github.com/python/cpython/commit/69ddd9bb2cc4bd69b1565647c18659c6a789ccd9

https://github.com/python/cpython/commit/482d6f8bdba9da3725d272e8bb4a2d25fb6a603e

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

Details

Source: Mitre, NVD

Published: 2026-03-04

Updated: 2026-05-01

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:C/A:N

Severity: Medium

CVSS v3

Base Score: 3.3

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Severity: Low

CVSS v4

Base Score: 5.7

Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00014