A flaw was found in dnsmasq. The DHCPv6 client hostname parser can read one byte past the end of a crafted FQDN option because it checks the next label length before confirming the pointer is still inside the option. An attacker on the local network can trigger this with a single DHCPv6 packet. The extra byte is not returned to the client or logged, and no crash has been demonstrated.
History

Fri, 06 Nov 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Redhat rhel Els
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat rhel Els

Wed, 04 Nov 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 30 Oct 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Dnsmasq
Dnsmasq dnsmasq
Red Hat
Red Hat enterprise Linux
Redhat openshift Container Platform
Redhat openstack Platform
Vendors & Products Dnsmasq
Dnsmasq dnsmasq
Red Hat
Red Hat enterprise Linux
Redhat openshift Container Platform
Redhat openstack Platform

Fri, 30 Oct 2026 08:15:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:openshift:5

Fri, 30 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Thu, 29 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in dnsmasq. The DHCPv6 client hostname parser can read one byte past the end of a crafted FQDN option because it checks the next label length before confirming the pointer is still inside the option. An attacker on the local network can trigger this with a single DHCPv6 packet. The extra byte is not returned to the client or logged, and no crash has been demonstrated.
Title Dnsmasq: dnsmasq: heap out-of-bounds read in dhcpv6 option 39 fqdn decoder
First Time appeared Redhat
Redhat ceph Storage
Redhat enterprise Linux
Redhat openshift
Redhat openstack
Weaknesses CWE-125
CPEs cpe:/a:redhat:ceph_storage:9
cpe:/a:redhat:openshift:4
cpe:/a:redhat:openstack:13
cpe:/a:redhat:openstack:18.0
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat ceph Storage
Redhat enterprise Linux
Redhat openshift
Redhat openstack
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-10-29T13:13:34.504Z

Updated: 2026-11-06T19:57:49.419Z

Reserved: 2026-09-17T14:35:34.562Z

Link: CVE-2026-93009

cve-icon Vulnrichment

Updated: 2026-11-04T01:14:33.686Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-29T14:18:00.367

Modified: 2026-11-06T20:17:29.210

Link: CVE-2026-93009

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-28T09:30:00Z

Links: CVE-2026-93009 - Bugzilla