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Vulnerability record · CVE-2026-4360 · published 30 June 2026

CVE-2026-4360: Python vulnerability

Python · Python

In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the user passing filter='data' to the extract() function.

2.0 CVSS 4.0 Low EPSS 0.48% · top 58.0% CWE-281 · CWE-281
2.0CVSS 4.0 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
25 Oct 2026Last modified by NVD

Description

In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the user passing filter='data' to the extract() function.

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:L/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/python/cpython/commit/0367912be336348b30572f8029cec4a282782d92
https://github.com/python/cpython/commit/5e0ef3f1afe892e4f64eb83368db57ac4c40cba0 Patch
https://github.com/python/cpython/commit/7b57e8d51446297b8c7c482d224bc5f1938e4301 Patch
https://github.com/python/cpython/commit/7ccdbaba2c54250a70d7f25632152df7655a5e0a Patch
https://github.com/python/cpython/commit/cf23b9153181062150d061468b6d24af33fe214f
https://github.com/python/cpython/commit/d2b2f5eacab4dd48446b63340613b05dcbbf0b44 Patch
https://github.com/python/cpython/commit/eee3ddf0ca10283cc7fea724aae9cd8665f8d15e Patch
https://github.com/python/cpython/issues/151987 Issue TrackingPatch
https://github.com/python/cpython/pull/151988 Issue TrackingPatch
https://mail.python.org/archives/list/security-announce@python.org/thread/TWZW2PC2AZOV6FENIHFSRC63OM7MBGSB/ Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-4360), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.