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CVE-2026-107778— MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()

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 Kerberos 5（krb5）1.22.2 及之前的版本存在一个空指针解引用漏洞，该漏洞位于 文件中的 函数。攻击者可以通过发送不匹配的 KRB-CRED 数组，使经过身份验证的 Kerberos 客户端导致服务崩溃，从而引发拒绝服务（DoS）攻击。 具体来说，攻击者可以通过 函数，转发包含的票据数量多于 条目数量的转发凭证，导致 GSS-API 接受端服务崩溃。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-107778

Vulnerability Information
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Vulnerability Title
MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()
Source: CVE Program / CVE List V5
Vulnerability Description
MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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-2026-107778

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III. Intelligence Information for CVE-2026-107778

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Other References for CVE-2026-107778 (6)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-107778

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