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CVE-2026-107708— MIT krb5 through 1.22.2 KDC NULL Pointer Dereference via S4U2Proxy PAC

Quick assessment

Affected
MIT krb5
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 krb5 1.22.2 及之前版本存在一个空指针解引用漏洞，该漏洞位于 KDC（密钥分发中心）的 函数中。在处理格式错误的名称时，该函数会返回成功，但会将客户端主体（client principal）保留为 NULL。恶意或已被攻陷的跨域可信 KDC 可以发送带有包含格式错误客户端名称的 PAC（特权属性证书）的 S4U2Proxy 请求，从而导致 krb5kdc 崩溃并拒绝身份验证服务。

CVSS 4.9 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-107708

Vulnerability Information
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Vulnerability Title
MIT krb5 through 1.22.2 KDC NULL Pointer Dereference via S4U2Proxy PAC
Source: CVE Program / CVE List V5
Vulnerability Description
MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
MIT krb5 0 ~ 1.22.2 -

II. Public POCs for CVE-2026-107708

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III. Intelligence Information for CVE-2026-107708

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Other References for CVE-2026-107708 (6)

IV. Related Vulnerabilities

Same product: krb5
Same vendor: MIT
Same weakness: CWE-476

V. Comments for CVE-2026-107708

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