CVE-2026-18728
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 10% of all known CVEs.
References
Related Vulnerabilities
Other CWE-191 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2014-0497 | Critical | 9.8 | 100% | KEV | Fix |
| CVE-2020-36221 | High | 7.5 | 84% | - | Fix |
| CVE-2020-36228 | High | 7.5 | 83% | - | Fix |
| CVE-2023-31102 | High | 7.8 | 71% | - | Fix |
| CVE-2024-38063 | Critical | 9.8 | 71% | - | Fix |
| CVE-2017-14496 | High | 7.5 | 63% | - | Fix |
Common questions
How do I fix CVE-2026-18728?
No published fix for CVE-2026-18728 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-18728 being actively exploited?
Not that we know of. CVE-2026-18728 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.20% is the estimated probability that it will be exploited in the next 30 days. That is higher than 10% of all scored CVEs.
How severe is CVE-2026-18728?
CVE-2026-18728 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-14.