CVE-2026-82049

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.

References

https://mail.python.org/archives/list/[email protected]/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/

https://github.com/python/cpython/pull/157191

https://github.com/python/cpython/issues/157190

https://github.com/python/cpython/commit/cc1689830c6b9aaddded2fb9f2fe8116867e2c0e

https://github.com/python/cpython/commit/c66df4e70435d257fd488b35ea129c6f317433a8

https://github.com/python/cpython/commit/b8f23e307097552eaea2604383a12ab280520d0d

https://github.com/python/cpython/commit/b38be2e6cf9d989075ab73412c63e003ebad4ff3

https://github.com/python/cpython/commit/5a57248b22ad3b9aafcaaadae2c304a1923daeca

https://github.com/python/cpython/commit/28f315486b3da0352b9a1de1c3c97f4127ba4771

https://github.com/python/cpython/commit/197663d63afed27f66e10e23c194e8a634e60913

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-77772

http://www.openwall.com/lists/oss-security/2026/09/14/27

Details

Source: Mitre, NVD

Named Vulnerability: GHSA-ghff-gcpf-9r9p

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS