CVE-2026-4360

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.

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EPSS — Exploit Prediction

0.0026

Probability of exploitation

0.18%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-281 CWE-281

References

Other 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/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/

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 do I check if I'm vulnerable to CVE-2026-4360? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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