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CVE-2026-40355

Quick assessment

Affected
MIT Kerberos 5
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.

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。

CVSS 5.9 · Medium EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
MIT Kerberos 5 1.18< 1.22.3 affected
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I. Basic Information for CVE-2026-40355

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-40355

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Patches & Fixes for CVE-2026-40355 (1)

Vendor Advisories for CVE-2026-40355 (1)

Security Blog Posts for CVE-2026-40355 (1)

IV. Related Vulnerabilities

Same product: Kerberos 5
Same vendor: MIT
Same weakness: CWE-476

V. Comments for CVE-2026-40355

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