CVE-2026-87910
Medium
Description
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.
SeverityMedium
CVSS5.7
Exploit probability—
ProductCPython
PublishedSep 11, 2026
First seenSep 11, 2026
Weakness typeCWE-22Path traversalCWE-59Improper link resolution
How to fix
Update
- Python Software Foundation CPython3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.9, 3.15.0rc3 or later
Patches
- github.com/python/cpython/pull/157266
- github.com/python/cpython/commit/d9565e54b1fc6d63c5be9afd58114499128fa57b
- github.com/python/cpython/commit/fb2f0bbc3b35264f09cc2cb2934b7987527a6bc2
- github.com/python/cpython/commit/9c17bace90f88dfba6d0e2fe23c8e7ae35f83955
- github.com/python/cpython/commit/764fd0af8d9e19d3684a58d2e58bf770f0605036
- github.com/python/cpython/commit/2eb0c2f1dc71847731b6ab30aebefd058d482a7f
- github.com/python/cpython/commit/c1f106d240c4ffcb3608ed0a20e8aba6c865f6d3
- github.com/python/cpython/commit/3105a3498aaf681ce128cf5baf83c2e5574267c5
- github.com/python/cpython/commit/a4919937a4e1e69a0d178909c6f20557eca5d1d0
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Python Software Foundation CPython | v < 3.10.22, 3.11.0 ≤ v < 3.11.17, 3.12.0 ≤ v < 3.12.15, 3.13.0 ≤ v < 3.13.16, 3.14.0 ≤ v < 3.14.9, 3.15.0a1 ≤ v < 3.15.0rc3 | 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.9, 3.15.0rc3 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.