CVE-2026-82049

EUVD-2026-77772
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.
Link Following
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
PSFCNA
8.4 HIGH
LOCAL
LOW
NONE
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
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
pythoncpython
𝑥
< 3.14.0b1
CNA
Common Weakness Enumeration
References
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/security-announce@python.org/thread/EFJWGAZJA56AKSBR2WHMHQZO7RRLZPRH/
http://www.openwall.com/lists/oss-security/2026/09/14/27