When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.

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History

Mon, 14 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-252
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N'}

threat_severity

Moderate


Sat, 12 Sep 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Python
Python cpython
Vendors & Products Python
Python cpython

Sat, 12 Sep 2026 01:00:00 +0000


Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
Description When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.
Title tarfile hardlink fallback ignores custom extraction filter rejection via None
Weaknesses CWE-22
CWE-59
References
Metrics cvssV4_0

{'score': 5.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-09-12T00:31:42.680Z

Reserved: 2026-09-09T15:11:08.270Z

Link: CVE-2026-87910

cve-icon Vulnrichment

Updated: 2026-09-11T21:07:14.642Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-11T18:16:59.800

Modified: 2026-09-16T19:42:12.090

Link: CVE-2026-87910

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-11T17:27:04Z

Links: CVE-2026-87910 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-12T22:00:07Z

Weaknesses