# CVE-2026-18728: A flaw was found in open-iscsi. An integer underflow vulnerability in the `iscsiuio` component, specifically during…

Source: https://junglewise.ai/threats/cve-2026-18728-a-flaw-was-found-in-open-iscsi-an-integer-underflow-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-13  
License: CC BY 4.0 with a link back

CVE-2026-18728 · Severity: medium · CVSS 6.5 · Published 2026-08-13

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.

Technologies: [Redhat Enterprise Linux](https://junglewise.ai/threats/technologies/enterprise-linux). Vendors: [Redhat](https://junglewise.ai/threats/vendors/redhat).

## Quick answers

**Is CVE-2026-18728 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18728 being exploited in the wild.

**How severe is CVE-2026-18728?** Medium severity, with a CVSS score of 6.5, published 13 August 2026.

**Which products and versions are affected?** Redhat Enterprise Linux. The advisory does not name versions.

**Is there a fix for CVE-2026-18728?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-18728?** Check whether you run Redhat Enterprise Linux. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Redhat Enterprise Linux

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