CVE-2026-18727

MEDIUM 6.5

Open-iscsi: open-iscsi: integer underflow in iscsiuio dhcpv6 parsing

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-191
Vendor	red hat
Product	red hat enterprise linux 10
Published	Aug 12, 2026

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CVSS v3 Breakdown

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

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Red Hat would like to thank Keith Linneman (Linneman Labs) for reporting this issue.