7.5

CVE-2026-3238: Samba: denial of service against ad dc wins server

Awaiting analysis
AliasesALPINE-CVE-2026-3238UBUNTU-CVE-2026-3238DEBIAN-CVE-2026-3238
Published 08-06-2026Last modified 01-09-2026

Vulnerability summary

CVE-2026-3238 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in samba. EPSS estimates a 2.67% chance of exploitation in the next 30 days, higher than 85.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 3% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
2.67%
0%100%
Low · +0.65 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 10
OPENSUSE-SU-2026:10884-1OPENSUSE-SU-2026:20905-1OPENSUSE-SU-2026:21540-1SUSE-SU-2026:22045-1SUSE-SU-2026:22080-1SUSE-SU-2026:23003-1

Timeline

  1. 08-06-2026
    PublishedVulnerability first disclosed.
  2. 01-09-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

2.67%

Chance of exploitation in the next 30 days

Percentile

86%

Versus all other CVEs

30-day change

Increase +0.65 pp

From 2.02% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • samba< 4.22.10-r0 | < 4.23.8-r0
Debian1 product
  • samba< 2:4.17.12+dfsg-0+deb12u4 | < 2:4.22.8+dfsg-0+deb13u2 | < 2:4.24.3+dfsg-1
Ubuntu1 product
  • sambaAll versions (No fix recorded) | < 2:4.15.13+dfsg-0ubuntu0.20.04.8+esm2 | < 2:4.15.13+dfsg-0ubuntu1.12 | < 2:4.19.5+dfsg-4ubuntu9.6 | < 2:4.22.3+dfsg-4ubuntu2.4 | < 2:4.23.6+dfsg-1ubuntu2.1

3 vendors · 3 products

References

10 links