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CVE-2026-67192— Xlight FTP Server < 3.9.5 Pre-Auth Stack Buffer Overflow via SSH GCM Cipher

Quick assessment

Affected
Xlight Xlight FTP Server
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.

xlight ftp server是xlight ftp server个人开发者的一款轻量级FTP服务器软件。 Xlight FTP Server 3.9.5之前版本存在缓冲区错误漏洞，该漏洞源于在GCM密码协商时发送畸形的SSH数据包，未验证的length字段直接传递给GCM解密函数，导致栈缓冲区溢出，可能允许未经身份验证的攻击者在认证前实现远程代码执行。

CVSS 8.1 · High EPSS 1.03% · P63

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xlight Xlight FTP Server < 3.9.5 affected
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I. Basic Information for CVE-2026-67192

Vulnerability Information
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Vulnerability Title
Xlight FTP Server < 3.9.5 Pre-Auth Stack Buffer Overflow via SSH GCM Cipher
Source: CVE Program / CVE List V5
Vulnerability Description
Xlight FTP Server before 3.9.5 contains a pre-authentication stack buffer overflow vulnerability that allows unauthenticated attackers to corrupt stack memory by sending malformed SSH packets when a GCM cipher is negotiated. Attackers can craft packets with an unvalidated length field passed directly to the GCM decrypt function, overwriting the stack cookie and return address to potentially achieve remote code execution before any authentication occurs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Xlight FTP Server 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xlight ftp server是xlight ftp server个人开发者的一款轻量级FTP服务器软件。 Xlight FTP Server 3.9.5之前版本存在缓冲区错误漏洞，该漏洞源于在GCM密码协商时发送畸形的SSH数据包，未验证的length字段直接传递给GCM解密函数，导致栈缓冲区溢出，可能允许未经身份验证的攻击者在认证前实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xlight Xlight FTP Server 0 ~ 3.9.5 -

II. Public POCs for CVE-2026-67192

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III. Intelligence Information for CVE-2026-67192

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Vendor Advisories for CVE-2026-67192 (1)

Vendor Pages for CVE-2026-67192 (1)

Same Patch Batch · Xlight · 2026-07-29 · 3 CVEs total

CVE-2026-67191 9.8 CRITICAL Xlight FTP Server < 3.9.5 Pre-Auth Heap Buffer Overflow via SSH Parser
CVE-2026-67193 5.3 MEDIUM Xlight FTP Server < 3.9.5 Information Disclosure via USER Command

IV. Related Vulnerabilities

Same product: Xlight FTP Server
Same vendor: Xlight
Same weakness: CWE-121

V. Comments for CVE-2026-67192

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