CVE-2026-97359 HFS2 2.4.0 RCE via Multipart Upload Filename Template Injection
Unauthenticated attackers can achieve remote code execution on HFS2 servers by injecting malicious template syntax into multipart upload filenames.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-97359?
CVE-2026-97359 is a critical code injection vulnerability in rejetto hfs2, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
HFS2 version 2.4.0 and earlier contains a template injection vulnerability in the multipart upload handler that allows unauthenticated attackers to achieve remote code execution by embedding malicious template syntax in a filename. Attackers can craft a filename containing a closing template quoting sequence followed by an exec macro, which bypasses the authorization check in the dispatcher to execute arbitrary commands on the underlying host system.
Weakness: CWE-1336
Which versions are affected by CVE-2026-97359?
How do I fix CVE-2026-97359?
No fix has been published for CVE-2026-97359 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-97359 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-97359 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-2w8r-rhgc-4pch.