Tarfile.extract() doesn't fully respect filter parameter

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Summary

CVECVE-2026-4360
StatePUBLISHED
AssignerPSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-30 15:16:57 UTC
Updated2026-06-30 16:16:55 UTC
DescriptionIn the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the user passing filter='data' to the extract() function.

Risk And Classification

Primary CVSS: v4.0 2 LOW from [email protected]

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:L/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

Problem Types: CWE-281 | CWE-281 CWE-281

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS2LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

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

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:L/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 3.15.0 python Not specified

References

ReferenceSourceLinkTags
github.com/python/cpython/issues/151987 [email protected] github.com
github.com/python/cpython/pull/151988 [email protected] github.com
github.com/python/cpython/commit/5e0ef3f1afe892e4f64eb83368db57ac4c40cba0 [email protected] github.com
github.com/python/cpython/commit/7b57e8d51446297b8c7c482d224bc5f1938e4301 [email protected] github.com
mail.python.org/archives/list/[email protected]/thread/TWZW2PC2AZO... [email protected] mail.python.org
github.com/python/cpython/commit/7ccdbaba2c54250a70d7f25632152df7655a5e0a [email protected] github.com
github.com/python/cpython/commit/eee3ddf0ca10283cc7fea724aae9cd8665f8d15e [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Michael Scovetta (https://github.com/scovetta) (en)

CNA: Seth Larson (https://github.com/sethmlarson) (en)

CNA: Petr Viktorin (https://github.com/encukou) (en)

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