CVE-2026-45384 bit7z: Arbitrary File Overwrite via Symlink Attack on Predictable Temp File During Archive Update
An attacker can overwrite arbitrary files via a symlink attack on predictable temporary files during archive updates in the bit7z library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45384?
CVE-2026-45384 is a medium-severity path traversal vulnerability in rikyoz bit7z, published on 10 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
bit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.12, there is an arbitrary file overwrite vulnerability via symlink attack on predictable temp files during archive update. This issue has been patched in version 4.0.12.
Which versions are affected by CVE-2026-45384?
How do I fix CVE-2026-45384?
No fix has been published for CVE-2026-45384 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-45384 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45384 exists.
Sources
Also known as GHSA-wjch-42rm-q53h.