Out-of-Bounds Read Vulnerability in Samba's KDC Password Change Service
CVE-2026-58216

5.3MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
30 July 2026

What is CVE-2026-58216?

An out-of-bounds read vulnerability exists in Samba's Kerberos Key Distribution Center (KDC) related to the password change service (kpasswd). This flaw arises when the server miscalculates the structure size while processing maliciously crafted ASN.1-encoded password change requests. If exploited, it may result in an attempt to read beyond the allocated memory buffer, potentially leading to a crash of the KDC process. While this generally leads to decryption issues, it can also trigger a denial of service condition if the out-of-bounds read interacts with unmapped memory.

References

https://access.redhat.com/security/cve/CVE-2026-58216
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2502721
issue-trackingx_refsource_REDHAT
https://bugzilla.samba.org/show_bug.cgi?id=16087

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Tristan Madani (@TristanInSec) (Talence Security) for reporting this issue.
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