Out-of-bounds read in Samba - CVE-2026-58216
Published: July 28, 2026 / Updated: July 29, 2026
Vulnerability identifier: #VU139942
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-58216
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
Samba
Samba
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the KDC kpasswd packet ASN.1 parsing when processing a malformed kpasswd packet. A remote user can send a specially crafted kpasswd packet to cause a denial of service.
The invalid access is limited to 6 bytes of unallocated memory, and the accessed memory is not exposed to the user.
How to mitigate CVE-2026-58216
Install security update from vendor's website.