CVE-2025-59343 tar-fs has a symlink validation bypass if destination directory is predictable with a specific tarball
Attackers can bypass symlink validation in tar-fs to write files outside the intended directory if the destination path is predictable.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-59343?
CVE-2025-59343 is a high-severity path traversal vulnerability in mafintosh tar-fs, published on 24 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
tar-fs provides filesystem bindings for tar-stream. Versions prior to 3.1.1, 2.1.3, and 1.16.5 are vulnerable to symlink validation bypass if the destination directory is predictable with a specific tarball. This issue has been patched in version 3.1.1, 2.1.4, and 1.16.6. A workaround involves using the ignore option on non files/directories.
Which versions are affected by CVE-2025-59343?
6 open source packages ship an affected version, including tar-fs.
| Package | Affected | Fixed in |
|---|---|---|
tar-fs npm | All versions | 1.16.6 |
tar-fs npm | All versions | 1.16.6 |
tar-fs npm | From 2.0.0 | 2.1.4 |
tar-fs npm | From 2.0.0 | 2.1.4 |
tar-fs npm | From 3.0.0 | 3.1.1 |
tar-fs npm | From 3.0.0 | 3.1.1 |
How do I fix CVE-2025-59343?
Upgrade tar-fs to a fixed version for your release line: 1.16.6, 2.1.4 or 3.1.1.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2025-59343 being exploited?
There is no known exploitation of CVE-2025-59343 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-59343, DLA-4313-1, DSA-6013-1, ECHO-2e8d-40a9-3ad3, GHSA-vj76-c3g6-qr5v, MINI-3cj6-3x8r-r2rj and 11 more.