What’s Vulnerable › Vulnerabilities

CVE-2026-82049: tarfile extraction filters allow file modification and content disclosure via hard link to symlink

• Severity: high (CVSS 8.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-10-11
• Weakness: CWE-59

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.

Affected products

• Python: before 3.10.22; from 3.11.0 before 3.11.17; from 3.12.0 before 3.12.15; from 3.13.0 before 3.13.16; from 3.14.0a1 before 3.14.0b1 — fixed in 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.0b1

How to fix

Upgrade to a fixed version: Python 3.10.22, 3.11.17, 3.12.15, 3.13.16. Check the vendor advisory for mitigations.

References

• https://github.com/python/cpython/commit/197663d63afed27f66e10e23c194e8a634e60913
• https://github.com/python/cpython/commit/28f315486b3da0352b9a1de1c3c97f4127ba4771
• 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/commit/c66df4e70435d257fd488b35ea129c6f317433a8
• https://github.com/python/cpython/commit/cc1689830c6b9aaddded2fb9f2fe8116867e2c0e
• https://github.com/python/cpython/commit/cccc7ec30212dba2abef53ce4a2bed112ddb690c
• https://github.com/python/cpython/issues/157190
• https://github.com/python/cpython/pull/157191
• https://mail.python.org/archives/list/security-announce@python.org/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/
• http://www.openwall.com/lists/oss-security/2026/09/14/27

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