CVE-2026-4360
Python ≤ 3.1.5
Raw vector
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:XSummary
CVE-2026-4360 is a low-severity Improper Preservation of Permissions (CWE-281) vulnerability in Python Python. Its CVSS base score is 2.0 (Low).
Operationally, ranked at the 18th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SI-7 (Software, Firmware, and Information Integrity) and AC-6 (Least Privilege) — see the control section below for these in your framework.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-40336
Vulnerability Data
In 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…
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extract() function.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Insufficient information to map techniques.CVEs Like This One
Affected Assets
Mitigating Controls
Control response
Mitigating Controls (NIST 800-53 r5) AI
Ensures integrity verification of extracted files so uid/gid changes introduced by the tarfile hard-link filter bypass are detected before the files are used.
Limits the system’s ability to run or retain untrusted tar-extraction utilities or scripts, reducing the attack surface for the described filter bypass.
Enforces least-privilege file ownership so that even if uid/gid values are written incorrectly, the resulting files cannot grant excessive rights to the extracting process.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Enforcing least-privilege permission policies and reviews directly prevents incorrect permission propagation on copy/restore/share operations.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Access-control policy defines how permissions must be preserved when objects are copied or shared.
Access-rights provisioning and review processes directly address the risk of overly permissive copied objects.
Privileged-access management includes rules for maintaining correct permissions on copied or restored data.
Information-access-restriction controls enforce least-privilege permissions that must be preserved during copy/restore operations.
Change-management procedures can require verification that permissions remain intact after modifications or restores.
Configuration baselines can embed permission settings, indirectly reducing the chance of incorrect preservation.
Hardening callouts derived
Configuration rules from DISA STIG baselines that reduce the attack surface for weaknesses of the type cited by this CVE. Derived transitively via CVE→CWE→STIG over `controls_xwalks` (authoritative rows only).
Windows Server 2016 (1 rule)
- V-224972 Active Directory Group Policy objects must have proper access control permissions. via CWE-281
Windows Server 2022 (1 rule)
- V-254395 Windows Server 2022 organization created Active Directory Organizational Unit (OU) objects must have proper access control permissions. via CWE-281