Vulnerability · Published Sep 24, 2026 · Assigned by VulnCheck

CVE-2026-97362HFS2 2.4.0 Unauthenticated Denial of Service via Hung Serving Thread

High 7.5

In plain English

A high-severity infinite loop in hfs2 from rejetto. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.3%top 78.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

HFS2 version 2.4.0 and earlier contains a denial of service vulnerability that allows unauthenticated attackers to cause a complete and persistent loss of availability by sending a single crafted request. Attackers can trigger a hung serving thread that enters a busy loop, rendering the entire file server unresponsive to all clients without self-recovery until an operator manually restarts the service.

Affected products (as reported)

Vendor	Product	Versions
rejetto	hfs2	2.0.0 – through 2.4.0

Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/wgetnz/hfs2/blob/master/advisories/hfs2-getini-infinite-loop-dos/README.md technical-description, exploit
VulnCheck Advisory third-party-advisory