Path Traversal in Python Software Foundation Cpython
CVE-2026-87910
When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
EPSS exploit prediction
EPSS: 0.006 (49.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
Weakness classification (CWE)
References
- mail.python.org/archives/list/security-announce@python.org/thread/57TBTLL2W6APM… (vendor-advisory)
- github.com/python/cpython/pull/157266 (patch)
- github.com/python/cpython/issues/157265 (issue-tracking)
- af854a3a-2127-422b-91ae-364da2661108
- github.com/python/cpython/commit/d9565e54b1fc6d63c5be9afd58114499128fa57b (patch)
- github.com/python/cpython/commit/fb2f0bbc3b35264f09cc2cb2934b7987527a6bc2 (patch)
- github.com/python/cpython/commit/9c17bace90f88dfba6d0e2fe23c8e7ae35f83955 (patch)
- github.com/python/cpython/commit/764fd0af8d9e19d3684a58d2e58bf770f0605036 (patch)
- github.com/python/cpython/commit/2eb0c2f1dc71847731b6ab30aebefd058d482a7f (patch)
- github.com/python/cpython/commit/c1f106d240c4ffcb3608ed0a20e8aba6c865f6d3 (patch)