---
id: CVE-2026-107778
title: >-
  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
summary: >-
  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 cr…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
published: '2026-10-08'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T12:17:09.410'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107778'
references:
  - url: 'https://github.com/krb5/krb5'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/krb5/krb5/blob/krb5-1.22.2-final/src/lib/krb5/krb/rd_cred.c#L77-L112
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/krb5/krb5/commit/48afa9abb89ab2176bb20624d87d010b9984fc08
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/krb5/krb5/commit/62196e2b269159a5465f5b8d0ed7cf6f29c3282a
    label: disclosure@vulncheck.com
  - url: 'https://github.com/krb5/krb5/pull/1511'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/mit-krb5-through-1.22.2-null-pointer-dereference-via-krb5-rd-cred
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-08T22:11:53.858Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.