CVE-2026-97359

CRITICAL 10.0

HFS2 2.4.0 RCE via Multipart Upload Filename Template Injection

CVSS Score

10.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-1336
Vendor	rejetto
Product	hfs2
Published	Sep 24, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

rejetto / hfs2

2.0.0 ≤ 2.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

wgetnz VulnCheck