What is CVE-2018-10858?

CVE-2018-10858 is a medium-severity vulnerability in Samba, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2018-08-22.

How severe is CVE-2018-10858?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Buffer overflow in Samba

CVE-2018-10858

A heap-buffer overflow was found in the way samba clients processed extra long filename in a directory listing. A malicious samba server could use this flaw to cause arbitrary code execution on a samba client. Samba versions before 4.6.16, 4.7.9 and 4.8.4 are vulnerable.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-08-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.043 (90.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.043 · newest: 0.043 · change: 0.000

Affected products

Samba
The Samba Team — versions 4.7.9, 4.6.16, 4.8.4
Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
Debian Linux — versions 9.0
Red Hat Enterprise Linux Desktop — versions 7.0
Red Hat Enterprise Linux Server — versions 7.0
Red Hat Enterprise Linux Workstation — versions 7.0
Red Hat Virtualization — versions 4.0
Red Hat Virtualization Host — versions 4.0

Weakness classification (CWE)

References

www.debian.org/security/2018/dsa-4271 (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2018:2613 (vendor-advisory, Third Party Advisory)
www.samba.org/samba/security/CVE-2018-10858.html (Vendor Advisory)
usn.ubuntu.com/3738-1/ (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2018:2612 (vendor-advisory, Third Party Advisory)
www.securityfocus.com/bid/105085 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1042002 (VDB Entry, Third Party Advisory, vdb-entry)
access.redhat.com/errata/RHSA-2018:3056 (vendor-advisory, Third Party Advisory)
security.netapp.com/advisory/ntap-20180814-0001/ (Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-10858?: CVE-2018-10858 is a medium-severity vulnerability in Samba, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2018-08-22.
How severe is CVE-2018-10858?: Medium severity. CVSS v3 base score is 4.3 out of 10.