CVE-2026-18728

Open-iscsi: open-iscsi: integer underflow in iscsiuio ipv4 dhcp parsing

CVE-2026-18728 is fixed in 9 products on 1 platform, first by DEBIAN-CVE-2026-18728, released August 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0031

24th percentile

A flaw was found in open-iscsi. An integer underflow vulnerability in the `iscsiuio` component, specifically during IPv4 Dynamic Host Configuration Protocol (DHCP) parsing, allows a remote attacker on the same local network segment to cause a denial of service. By sending a specially crafted IPv4/UDP DHCP reply, the attacker can trigger an out-of-bounds read, leading to the `iscsiuio` process crashing. This issue affects systems where `iscsiuio` is actively handling IPv4 DHCP traffic.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
iscsi-initiator-utils · amzn 2023	6.2.1.4-10.git2a8f9d8.amzn2023.0.4	ALAS2023-2026-2120	Aug 31, 2026
iscsi-initiator-utils-debuginfo · amzn 2023	6.2.1.4-10.git2a8f9d8.amzn2023.0.4	ALAS2023-2026-2120	Aug 31, 2026
iscsi-initiator-utils-debugsource · amzn 2023	6.2.1.4-10.git2a8f9d8.amzn2023.0.4	ALAS2023-2026-2120	Aug 31, 2026
iscsi-initiator-utils-devel · amzn 2023	6.2.1.4-10.git2a8f9d8.amzn2023.0.4	ALAS2023-2026-2120	Aug 31, 2026
iscsi-initiator-utils-iscsiuio · amzn 2023	6.2.1.4-10.git2a8f9d8.amzn2023.0.4	ALAS2023-2026-2120	Aug 31, 2026
iscsi-initiator-utils-iscsiuio-debuginfo · amzn 2023	6.2.1.4-10.git2a8f9d8.amzn2023.0.4	ALAS2023-2026-2120	Aug 31, 2026
open-iscsi · Debian 12.15 (bookworm)	2.1.8-1+deb12u1	DEBIAN-CVE-2026-18728	Aug 13, 2026
open-iscsi · Debian 14	2.1.13-1	DEBIAN-CVE-2026-18728	Aug 13, 2026
python3-iscsi-initiator-utils · amzn 2023	6.2.1.4-10.git2a8f9d8.amzn2023.0.4	ALAS2023-2026-2120	Aug 31, 2026
python3-iscsi-initiator-utils-debuginfo · amzn 2023	6.2.1.4-10.git2a8f9d8.amzn2023.0.4	ALAS2023-2026-2120	Aug 31, 2026

Details

Published
August 13, 2026
Weakness
Integer Underflow (Wrap or Wraparound)
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18728

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