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

Quick assessment

Affected
rejetto hfs2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HFS2 2.4.0 及更早版本存在一个拒绝服务漏洞，允许未经身份验证的攻击者通过发送一个精心构造的请求，导致服务完全且持久地不可用。攻击者可以触发一个卡住的服务器线程，该线程会进入忙等待循环，从而使整个文件服务器对所有客户端无响应，且系统无法自行恢复，必须由操作员手动重启服务才能恢复正常。

CVSS 7.5 · High EPSS 0.29% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
rejetto hfs2 2.0.0≤ 2.4.0 affected
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I. Basic Information for CVE-2026-97362

Vulnerability Information
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Vulnerability Title
HFS2 2.4.0 Unauthenticated Denial of Service via Hung Serving Thread
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rejetto hfs2 2.0.0 ~ 2.4.0 -

II. Public POCs for CVE-2026-97362

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III. Intelligence Information for CVE-2026-97362

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Vendor Advisories for CVE-2026-97362 (1)

Security Blog Posts for CVE-2026-97362 (1)

Same Patch Batch · rejetto · 2026-09-24 · 3 CVEs total

CVE-2026-97359 10.0 CRITICAL HFS2 2.4.0 RCE via Multipart Upload Filename Template Injection
CVE-2026-97360 10.0 CRITICAL HFS2 2.4.0 Unauthenticated Arbitrary File Read/Write via Template Engine

IV. Related Vulnerabilities

Same product: hfs2
Same vendor: rejetto
Same weakness: CWE-835

V. Comments for CVE-2026-97362

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