Extraction filter bypass for linking outside extraction directory

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-4330
StatePUBLISHED
AssignerPSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-06-03 13:15:20 UTC
Updated2026-07-31 14:16:44 UTC
DescriptionAllows the extraction filter to be ignored, allowing symlink targets to point outside the destination directory, and the modification of some file metadata. You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() using the filter= parameter with a value of "data" or "tar". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter  for more information. Note that for Python 3.14 or later the default value of filter= changed from "no filtering" to `"data", so if you are relying on this new default behavior then your usage is also affected. Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.008370000 probability, percentile 0.542190000 (date 2026-08-03)

Problem Types: CWE-22 | CWE-22 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Python Software Foundation CPython affected 3.9.23 python Not specified
CNA Python Software Foundation CPython affected 3.10.0 3.10.18 python Not specified
CNA Python Software Foundation CPython affected 3.11.0 3.11.13 python Not specified
CNA Python Software Foundation CPython affected 3.12.0 3.12.11 python Not specified
CNA Python Software Foundation CPython affected 3.13.0 3.13.4 python Not specified
CNA Python Software Foundation CPython affected 3.14.0a1 3.14.0b3 python Not specified

References

ReferenceSourceLinkTags
github.com/python/cpython/commit/4633f3f497b1ff70e4a35b6fe2c907cbe2d4cb2e [email protected] github.com
github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a [email protected] github.com
github.com/python/cpython/commit/dd8f187d0746da151e0025c51680979ac5b4cfb1 [email protected] github.com
github.com/python/cpython/pull/135037 [email protected] github.com
github.com/python/cpython/commit/9c1110ef6652687d7c55f590f909720eddde965a [email protected] github.com
github.com/python/cpython/issues/135034 [email protected] github.com
github.com/python/cpython/commit/19de092debb3d7e832e5672cc2f7b788d35951da [email protected] github.com
github.com/python/cpython/commit/28463dba112af719df1e8b0391c46787ad756dd9 [email protected] github.com
gist.github.com/sethmlarson/52398e33eff261329a0180ac1d54f42f [email protected] gist.github.com
github.com/python/cpython/commit/aa9eb5f757ceff461e6e996f12c89e5d9b583b01 [email protected] github.com
github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a [email protected] github.com
mail.python.org/archives/list/[email protected]/thread/MAXIJJCUUMC... [email protected] mail.python.org
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: Caleb Brown (Google) (en)

CNA: Petr Viktorin (en)

CNA: Serhiy Storchaka (en)

CNA: Hugo van Kemenade (en)

CNA: Łukasz Langa (en)

CNA: Thomas Wouters (en)

CNA: Seth Larson (en)

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