CVE-2019-13173: Fstream Project Fstream

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

fstream before 1.0.12 is vulnerable to Arbitrary File Overwrite. Extracting tarballs containing a hardlink to a file that already exists in the system, and a file that matches the hardlink, will overwrite the system's file with the contents of the extracted file. The fstream.DirWriter() function is vulnerable.

Affected products

• Fstream Project Fstream: before 1.0.12 (fixed in 1.0.12)

Published 2019-07-02. Last modified 2026-06-17.