CVE-2026-11940
tarfile extraction filter bypass allows escaping the destination directory
Description
tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting a relative target the filter judged contained escape the destination directory. This allowed a malicious tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads or writes. This was an incomplete fix of CVE-2025-4330.
INFO
Published Date :
June 23, 2026, 4:04 p.m.
Last Modified :
June 23, 2026, 4:05 p.m.
Remotely Exploit :
Yes !
Source :
PSF
Affected Products
The following products are affected by CVE-2026-11940
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 28c92f92-d60d-412d-b760-e73465c3df22 |
Solution
- Update the tarfile library to the latest version.
- Ensure archive extraction filters are properly configured.
- Validate archive contents before extraction.
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CVE-2026-11940 vulnerability anywhere in the article.