Vulnerability record · CVE-2026-18727 · published 12 August 2026

CVE-2026-18727: Redhat enterprise linux vulnerability

Redhat · Enterprise Linux

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.

6.5 CVSS 3.1 Medium EPSS 0.19% · top 92.4% CWE-191 · CWE-191

6.5CVSS 3.1 base score

0.19%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References

25 Aug 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Enterprise Linux Redhat

References

Link	Tags
https://access.redhat.com/security/cve/CVE-2026-18727	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2462956	Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-18727), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.