CVE-2026-18727 — MEDIUM (6.5)

Vulnerability Description

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.

CVSS Score

6.5

MEDIUM

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

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Redhat	Enterprise Linux	9.0

Related Weaknesses (CWE)

CWE-191

References

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

FAQ

What is CVE-2026-18727?

CVE-2026-18727 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...

How severe is CVE-2026-18727?

CVE-2026-18727 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18727?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Enterprise Linux.