Out-of-bounds write in Samba - CVE-2026-6949
Published: July 28, 2026 / Updated: July 29, 2026
Vulnerability identifier: #VU139941
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-6949
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
Samba
Samba
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in the DNS server TSIG record handling when processing a TSIG packet containing compressed names. A remote attacker can send a specially crafted TSIG packet to cause a denial of service.
How to mitigate CVE-2026-6949
Install security update from vendor's website.