What’s Vulnerable › Vulnerabilities

CVE-2026-97359: HFS2 2.4.0 RCE via Multipart Upload Filename Template Injection

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-24 · updated 2026-09-29
• Weakness: CWE-1336

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.

Affected products

• rejetto hfs2: from 2.0.0 through 2.4.0

References

• https://github.com/wgetnz/hfs2/blob/master/advisories/hfs2-upload-filename-template-injection/README.md
• https://www.vulncheck.com/advisories/hfs2-rce-via-multipart-upload-filename-template-injection
• https://github.com/wgetnz/hfs2/blob/master/advisories/hfs2-upload-filename-template-injection/README.md

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