SourcelessFileLoader does not use io.open_code()

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Summary

CVECVE-2026-2297
StatePUBLISHED
AssignerPSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-04 23:16:10 UTC
Updated2026-05-01 16:16:30 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v4.0 5.7 MEDIUM from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000180000 probability, percentile 0.047230000 (date 2026-05-05)

Problem Types: CWE-668 | CWE-668 CWE-668 Exposure of Resource to Wrong Sphere

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.7MEDIUMCVSS: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/C...
4.0CNACVSS5.7MEDIUMCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
Low
User Interaction
None
Confidentiality
None
Integrity
High
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Python Software Foundation CPython affected 3.13.13 python Not specified
CNA Python Software Foundation CPython affected 3.14.0 3.14.4 python Not specified
CNA Python Software Foundation CPython affected 3.15.0a1 3.15.0a7 python Not specified

References

ReferenceSourceLinkTags
github.com/python/cpython/commit/482d6f8bdba9da3725d272e8bb4a2d25fb6a603e [email protected] github.com
github.com/python/cpython/commit/e58e9802b9bec5cdbf48fc9bf1da5f4fda482e86 [email protected] github.com
github.com/python/cpython/issues/145506 [email protected] github.com
github.com/python/cpython/commit/69ddd9bb2cc4bd69b1565647c18659c6a789ccd9 [email protected] github.com
www.openwall.com/lists/oss-security/2026/03/05/6 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/python/cpython/pull/145507 [email protected] github.com
github.com/python/cpython/commit/876858c9f65d9ab656c7fa639f268ce7856d89dd [email protected] github.com
github.com/python/cpython/commit/a51b1b512de1d56b3714b65628a2eae2b07e535e [email protected] github.com
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