CVE-2026-4360

CVE-2026-4360 is a low-severity vulnerability with a CVSS 4.0 base score of 2.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-281.

Key facts

• Severity: Low (CVSS 4.0 base score 2.0)
• EPSS exploit prediction: 0% (23rd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-281
• Published: 2026-06-30
• Last modified: 2026-07-07

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.

Frequently asked questions

What is CVE-2026-4360?

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.

How severe is CVE-2026-4360?

CVE-2026-4360 has a CVSS 4.0 base score of 2.0, rated low severity.

Is CVE-2026-4360 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4360?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-4360 published?

CVE-2026-4360 was published on 2026-06-30 and last updated on 2026-07-07.

References

• https://github.com/python/cpython/commit/5e0ef3f1afe892e4f64eb83368db57ac4c40cba0
• https://github.com/python/cpython/commit/7b57e8d51446297b8c7c482d224bc5f1938e4301
• https://github.com/python/cpython/commit/7ccdbaba2c54250a70d7f25632152df7655a5e0a
• https://github.com/python/cpython/commit/d2b2f5eacab4dd48446b63340613b05dcbbf0b44
• https://github.com/python/cpython/commit/eee3ddf0ca10283cc7fea724aae9cd8665f8d15e
• https://github.com/python/cpython/issues/151987
• https://github.com/python/cpython/pull/151988
• https://mail.python.org/archives/list/[email protected]/thread/TWZW2PC2AZOV6FENIHFSRC63OM7MBGSB/

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