---
id: CVE-2026-58216
title: >-
  An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution
  Center's (KDC) password change (kpasswd) service
summary: >-
  An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution
  Center's (KDC) password change (kpasswd) service. When processing malformed
  ASN.1-encoded Kerberos password change request, Samba server miscalculates the
  structur…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
published: '2026-07-30'
updated: '2026-07-31'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-58216'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-58216'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2502721'
    label: secalert@redhat.com
  - url: 'https://bugzilla.samba.org/show_bug.cgi?id=16087'
    label: secalert@redhat.com
  - url: 'https://www.samba.org/samba/security/CVE-2026-58216.html'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00464
epssPercentile: 0.3747
ingestedAt: '2026-08-01T22:15:46.114Z'
---

## Overview

An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.

## Remediation

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