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CVE-2025-4435 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

When using a TarFile.errorlevel = 0 and extracting with a filter the documented behavior is that any filtered members would be skipped and not extracted. However the actual behavior of TarFile.errorlevel = 0 in affected versions is that the member would still be extracted and not skipped.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/python/cpython/commit/19de092debb3d7e832e5672cc2f7b788d35951da	[email protected]	Source CodeVendor
https://github.com/python/cpython/commit/28463dba112af719df1e8b0391c46787ad756dd9	[email protected]
https://github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a	[email protected]	Source CodeVendor
https://github.com/python/cpython/commit/4633f3f497b1ff70e4a35b6fe2c907cbe2d4cb2e	[email protected]
https://github.com/python/cpython/commit/9c1110ef6652687d7c55f590f909720eddde965a	[email protected]
https://github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a	[email protected]	Source CodeVendor
https://github.com/python/cpython/commit/aa9eb5f757ceff461e6e996f12c89e5d9b583b01	[email protected]	Source CodeVendor
https://github.com/python/cpython/commit/dd8f187d0746da151e0025c51680979ac5b4cfb1	[email protected]
https://github.com/python/cpython/issues/135034	[email protected]	Issue TrackingTechnical DescriptionVendor
https://github.com/python/cpython/pull/135037	[email protected]	Pull RequestVendor
https://mail.python.org/archives/list/[email protected]/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/	[email protected]	AdvisoryBundleRemedy

see all 11 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-682	Incorrect Calculation	CISA-ADP

Affected Products

Product	Versions
Python	>= 3.12, < 3.12.11 >= 3.13, < 3.13.4 >= 3.14, < 3.14.0
CPE cpe:2.3:a:python:python:::::::: Remediation Upgrade: 3.12.11moderate effort Upgrade: 3.13.4moderate effort Upgrade: 3.14.0moderate effort Mitigation:low effort Reject all links with the parent directory segment ('..') prior to calling extract: for member in tar.getmembers(): if not member.islnk(): continue if os.pardir in os.path.split(member.linkname): raise OSError("Tarfile with insecure segment ('..') in linkname") # Now safe to extract members with the data filter. tar.extractall(filter="data")

Product

Versions

Python

>= 3.12, < 3.12.11

>= 3.13, < 3.13.4

>= 3.14, < 3.14.0

CPE

cpe:2.3:a:python:python:*:*:*:*:*:*:*:*

Remediation

Upgrade: 3.12.11moderate effort
Upgrade: 3.13.4moderate effort
Upgrade: 3.14.0moderate effort
Mitigation:low effort
Reject all links with the parent directory segment ('..') prior to calling extract: for member in tar.getmembers(): if not member.islnk(): continue if os.pardir in os.path.split(member.linkname): raise OSError("Tarfile with insecure segment ('..') in linkname") # Now safe to extract members with the data filter. tar.extractall(filter="data")

Change History

10 change records found show changes

Date	Action	Recorded By
Jul 31, 2026	CVE Modified	[email protected]
Jul 30, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Jun 3, 2025	CVE Modified	[email protected]
Jun 3, 2025	CVE Modified	[email protected]
Jun 3, 2025	CVE Modified	CISA-ADP
Jun 3, 2025	CVE Modified	[email protected]
Jun 3, 2025	CVE Modified	[email protected]
Jun 3, 2025	New CVE Received	[email protected]