CVE-2026-3238
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.67%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.67% probability · 85th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Source
- secalert@redhat.com
References
- https://access.redhat.com/security/cve/CVE-2026-3238
- https://bugzilla.redhat.com/show_bug.cgi?id=2486176
- https://www.samba.org/samba/security/CVE-2026-3238.html
- https://access.redhat.com/security/cve/CVE-2026-3238
- https://bugzilla.redhat.com/show_bug.cgi?id=2486176
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3238.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.