Vulnerability record · CVE-2026-82049 · published 14 September 2026

CVE-2026-82049: Link following vulnerability

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.

8.4 CVSS 4.0 High EPSS 0.19% · top 92.1% CWE-59 · Link following Awaiting Analysis

8.4CVSS 4.0 base score

0.19%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

7References

16 Sep 2026Last modified by NVD

Description

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/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:

References

Link	Tags
https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca
https://github.com/python/cpython/commit/b38be2e6cf9d989075ab73412c63e003ebad4ff3
https://github.com/python/cpython/commit/b8f23e307097552eaea2604383a12ab280520d0d
https://github.com/python/cpython/issues/157190
https://github.com/python/cpython/pull/157191
https://mail.python.org/archives/list/[email protected]/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/
http://www.openwall.com/lists/oss-security/2026/09/14/27

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-82049), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.