CVE-2026-18728

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-13. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 18, 2026

Advisory Details (2)

Auto-updated Aug 13, 2026
Patch available. Sources: redhat.
redhat

2463029 – (CVE-2026-18728) CVE-2026-18728 open-iscsi: open-iscsi: Integer underflow in iscsiuio IPv4 DHCP parsing

https://bugzilla.redhat.com/show_bug.cgi?id=2463029
redhat Patch Available

CVE-2026-18728 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18728

Vendor Advisories for CVE-2026-18728(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 23× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 10:30 UTCEG score recompute
  3. 2026-08-20 10:30 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 12:41 UTCGHSA enrichment
  6. 2026-08-18 14:52 UTCEG score recompute
  7. 2026-08-18 14:52 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 16:47 UTCEG score recompute
  10. 2026-08-17 16:47 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 18:58 UTCEG score recompute
  13. 2026-08-16 18:58 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 21:09 UTCEG score recompute
  17. 2026-08-15 21:09 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 23:19 UTCEG score recompute
  20. 2026-08-14 23:19 UTCGHSA enrichment
  21. 2026-08-14 22:39 UTCEG score recompute
  22. 2026-08-14 22:39 UTCGHSA enrichment
  23. 2026-08-14 19:18 UTCGHSA enrichment
  24. 2026-08-14 02:09 UTCEG score recompute
  25. 2026-08-14 02:09 UTCGHSA enrichment
Show 4 more
  1. 2026-08-13 22:00 UTCEPSS rescore
  2. 2026-08-13 04:20 UTCEG score recompute
  3. 2026-08-13 03:31 UTCEG score recompute
  4. 2026-08-13 03:30 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18728?
CVE-2026-18728 is a medium vulnerability published on August 13, 2026. 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…
When was CVE-2026-18728 disclosed?
CVE-2026-18728 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18728 actively exploited?
CVE-2026-18728 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.0% of all scored CVEs.
What is the CVSS score of CVE-2026-18728?
CVE-2026-18728 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-18728?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18728, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18728

Explore →

Is Your Infrastructure Affected by CVE-2026-18728?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs