Description
In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.
Published: 2026-09-14
Score: 8.4 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 15 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N'}

threat_severity

Important


Tue, 15 Sep 2026 06:15:00 +0000

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

Tue, 15 Sep 2026 00:45:00 +0000


Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Description In CPython 3.13 and earlier, the tarfile module's data and tar extraction filters are vulnerable to crafted archives containing a hard link to a symbolic link. Such archives may cause extraction to modify the permissions or modification time of a file outside the destination directory, or expose the contents of that file within the extracted tree.
Title tarfile extraction filters allow file modification and content disclosure via hard link to symlink
Weaknesses CWE-59
References
Metrics cvssV4_0

{'score': 8.4, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

ssvc

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


cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-09-15T00:34:01.076Z

Reserved: 2026-08-27T22:23:05.514Z

Link: CVE-2026-82049

cve-icon Vulnrichment

Updated: 2026-09-14T20:07:50.158Z

cve-icon NVD

Status : Received

Published: 2026-09-14T19:17:50.927

Modified: 2026-09-15T01:16:51.997

Link: CVE-2026-82049

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-14T19:14:03Z

Links: CVE-2026-82049 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T12:15:08Z

Weaknesses
  • CWE-59

    Improper Link Resolution Before File Access ('Link Following')