CVE-2026-18727 MEDIUM

CVE-2026-18727: Open-iscsi: open-iscsi: integer underflow in iscsiuio dhcpv6 parsing

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-191
Published August 12, 2026
Last update August 13, 2026

CVSS base score

6.5/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

A flaw was found in open-iscsi's iscsiuio component. This vulnerability involves an integer underflow and out-of-bounds read during Dynamic Host Configuration Protocol for IPv6 (DHCPv6) packet parsing. Specifically, crafted DHCPv6 Advertise traffic with a short User Datagram Protocol (UDP) length can cause the DHCPv6 payload length to underflow. An unauthenticated attacker on an adjacent network segment can exploit this by sending specially crafted IPv6 UDP traffic while the client is in an active DHCPv6 exchange, leading to a denial of service due to a process crash or service disruption.

Key dates

02Disclosure timeline

August 12, 2026 CVE published
August 13, 2026 Record updated