CVE-2026-40355
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I. Basic Information for CVE-2026-40355
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, causing the process to terminate in parse_nego_message.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
空指针解引用
Source: NVD (National Vulnerability Database)
Vulnerability Title
MIT Kerberos 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MIT Kerberos是美国麻省理工学院（MIT）的一个用于在网络集群中进行身份验证的软件。Kerberos 同时作为一种网络认证协议，其设计目标是通过密钥系统为客户机 / 服务器应用程序提供强大的认证服务。 MIT Kerberos 5 1.22.3之前版本存在代码问题漏洞，该漏洞源于在系统注册了/etc/gss/mech中NegoEx机制时调用gss_accept_sec_context()，可能导致未经身份验证的远程攻击者触发parse_nego_message中的空指针取消引用，导致进程终止。
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 |
|---|---|---|---|---|
| MIT | Kerberos 5 | 1.18 ~ 1.22.3 | - |
II. Public POCs for CVE-2026-40355
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same weakness: CWE-476
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V. Comments for CVE-2026-40355
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