CVE-2026-97359

HFS2 2.4.0 RCE via Multipart Upload Filename Template Injection

CRITICAL 10.0EPSS 0.8%

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: rejetto · hfs2
CVSS v4.0 VULNCHECK: 10.0 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 VULNCHECK: 10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.78% chance of exploitation in the next 30 days, 55th percentile
Published: 2026-09-24
Updated: 2026-09-29

Proof-of-concept exploits (1)

wgetnz/hfs2/blob/master/advisories/hfs2-upload-filename-template-injection/README.md0★ · 2026-09-24

CVE-2026-97359

Proof-of-concept exploits (1)

References

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