CVE-2026-7774

Description

tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.

EPSS — Exploit Prediction

0.0061

Probability of exploitation

0.45%

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-22 Path Traversal

References

Other References

https://github.com/python/cpython/commit/0478bd83d82b255e0f29f613367a59d261e7eaa2 https://github.com/python/cpython/commit/0d28f5e46e151718972dfabd91205444d0037b6d https://github.com/python/cpython/commit/578411982c16f753f4893532510099ef665117da https://github.com/python/cpython/commit/5cf47a248c35c375d610b87b2f72fd1ed454b558 https://github.com/python/cpython/commit/74cca9a92fb7d653e404843a56b8bdc7b0afdbbf https://github.com/python/cpython/issues/149486 https://github.com/python/cpython/pull/149487 https://mail.python.org/archives/list/[email protected]/thread/4FU62L2M6RMMHT2QPGQNPEHHUND7CEX5/ http://www.openwall.com/lists/oss-security/2026/06/04/9

Frequently Asked Questions

What is CVE-2026-7774? +

tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.

How do I check if I'm vulnerable to CVE-2026-7774? +

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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