High severity · published Jun 8, 2026
CVE-2026-3238
Samba: denial of service against ad dc wins server
7.5
CVSS
2.7%
EPSS
No
On KEV
Description
A flaw was found in Samba’s WINS server component when running as an Active Directory Domain Controller. The WINS protocol handlers for certain request types did not properly validate incoming packets, allowing an unauthenticated remote attacker to trigger a NULL pointer dereference and crash the WINS service using specially crafted UDP packets.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.7% · higher than 86% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat OpenShift Container Platform 4
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3238
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3238
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-3238
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2486176
www.samba.org
https://www.samba.org/samba/security/CVE-2026-3238.html
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3238.json
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