What’s Vulnerable › Vulnerabilities
CVE-2026-7774: tarfile.data_filter path traversal bypass allows writing outside the extraction directory
- Severity: medium (CVSS 6.9 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-04 · updated 2026-08-13
- Weakness: CWE-22
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.
Affected products
- Python: before 3.10.21; from 3.11.0 before 3.11.16; from 3.12.0 before 3.12.14; from 3.13.0 before 3.13.14; from 3.14.0 before 3.14.6; from 3.15.0a1 before 3.15.0b2 — fixed in 3.10.21, 3.11.16, 3.12.14, 3.13.14, 3.14.6, 3.15.0b2
How to fix
Upgrade to a fixed version: Python 3.10.21, 3.11.16, 3.12.14, 3.13.14. Check the vendor advisory for mitigations.
References
- https://github.com/python/cpython/commit/0478bd83d82b255e0f29f613367a59d261e7eaa2
- https://github.com/python/cpython/commit/0d28f5e46e151718972dfabd91205444d0037b6d
- https://github.com/python/cpython/commit/10a13bee3c24f9c62b602e696334ff2272a40efc
- 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/commit/c063191cb7f9170f9565e305f8aa2b79ab2bf609
- https://github.com/python/cpython/issues/149486
- https://github.com/python/cpython/pull/149487
- https://mail.python.org/archives/list/security-announce@python.org/thread/4FU62L2M6RMMHT2QPGQNPEHHUND7CEX5/
- http://www.openwall.com/lists/oss-security/2026/06/04/9
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