VulnerabilityAwaiting Analysis
CVE-2026-2297
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.
MEDIUM 5.7EPSS 0.21%
Does this matter?
Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 4.0
- 5.7 MEDIUMCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.21% probability · 12th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-668
- Source
- cna@python.org
References
- https://github.com/python/cpython/commit/482d6f8bdba9da3725d272e8bb4a2d25fb6a603e
- https://github.com/python/cpython/commit/69ddd9bb2cc4bd69b1565647c18659c6a789ccd9
- https://github.com/python/cpython/commit/876858c9f65d9ab656c7fa639f268ce7856d89dd
- https://github.com/python/cpython/commit/a51b1b512de1d56b3714b65628a2eae2b07e535e
- https://github.com/python/cpython/commit/c70adad78caeeea33f92f560ecb93331ca11bf66
- https://github.com/python/cpython/commit/e58e9802b9bec5cdbf48fc9bf1da5f4fda482e86
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.