CVE-2026-18728

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-13. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 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(medium)
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
9%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 25, 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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
open-iscsi2.1.10-1 ... 2.1.9-4 (17 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
open-iscsi2.1.11-1 ... 2.1.12-2 (10 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
open-iscsi2.1.11-1 ... 2.1.12-2 (8 versions)——

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 22× in last 7d / 82× 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.

Showing the most recent 100 of 110 total refreshes for this CVE.

  1. 2026-09-18 22:10 UTCEG score recompute
  2. 2026-09-18 22:10 UTCVendor advisory
  3. 2026-09-18 22:10 UTCGHSA enrichment
  4. 2026-09-18 19:27 UTCEPSS rescore
  5. 2026-09-17 22:22 UTCEG score recompute
  6. 2026-09-17 22:22 UTCVendor advisory
  7. 2026-09-17 22:22 UTCGHSA enrichment
  8. 2026-09-17 00:15 UTCEG score recompute
  9. 2026-09-17 00:15 UTCVendor advisory
  10. 2026-09-17 00:15 UTCGHSA enrichment
  11. 2026-09-16 14:07 UTCEPSS rescore
  12. 2026-09-16 05:14 UTCEPSS rescore
  13. 2026-09-15 20:13 UTCEG score recompute
  14. 2026-09-15 20:13 UTCVendor advisory
  15. 2026-09-15 20:13 UTCGHSA enrichment
  16. 2026-09-14 20:55 UTCVendor advisory
  17. 2026-09-14 20:55 UTCGHSA enrichment
  18. 2026-09-13 19:34 UTCEG score recompute
  19. 2026-09-13 19:34 UTCGHSA enrichment
  20. 2026-09-13 16:46 UTCEPSS rescore
  21. 2026-09-12 21:45 UTCEG score recompute
  22. 2026-09-12 21:45 UTCGHSA enrichment
  23. 2026-09-12 15:00 UTCEPSS rescore
  24. 2026-09-11 23:56 UTCEG score recompute
  25. 2026-09-11 23:56 UTCGHSA enrichment
Show 75 more
  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-11 00:57 UTCEG score recompute
  4. 2026-09-11 00:57 UTCGHSA enrichment
  5. 2026-09-10 09:34 UTCEPSS rescore
  6. 2026-09-10 03:01 UTCGHSA enrichment
  7. 2026-09-09 05:08 UTCEG score recompute
  8. 2026-09-09 05:08 UTCGHSA enrichment
  9. 2026-09-08 22:00 UTCEPSS rescore
  10. 2026-09-07 18:09 UTCEG score recompute
  11. 2026-09-07 18:09 UTCGHSA enrichment
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 20:20 UTCEG score recompute
  14. 2026-09-06 20:19 UTCGHSA enrichment
  15. 2026-09-06 13:47 UTCEPSS rescore
  16. 2026-09-05 22:29 UTCEG score recompute
  17. 2026-09-05 22:29 UTCGHSA enrichment
  18. 2026-09-05 00:39 UTCEG score recompute
  19. 2026-09-05 00:39 UTCGHSA enrichment
  20. 2026-09-04 05:06 UTCEPSS rescore
  21. 2026-09-03 21:14 UTCGHSA enrichment
  22. 2026-09-02 23:24 UTCEG score recompute
  23. 2026-09-02 23:24 UTCGHSA enrichment
  24. 2026-09-02 14:11 UTCEPSS rescore
  25. 2026-09-01 23:47 UTCEG score recompute
  26. 2026-09-01 23:47 UTCGHSA enrichment
  27. 2026-09-01 13:53 UTCEPSS rescore
  28. 2026-09-01 01:58 UTCGHSA enrichment
  29. 2026-08-31 04:03 UTCEG score recompute
  30. 2026-08-31 04:03 UTCGHSA enrichment
  31. 2026-08-30 19:17 UTCEPSS rescore
  32. 2026-08-30 06:13 UTCEG score recompute
  33. 2026-08-30 06:13 UTCGHSA enrichment
  34. 2026-08-30 01:22 UTCEPSS rescore
  35. 2026-08-29 08:24 UTCEG score recompute
  36. 2026-08-29 08:24 UTCGHSA enrichment
  37. 2026-08-28 21:41 UTCEPSS rescore
  38. 2026-08-28 09:08 UTCGHSA enrichment
  39. 2026-08-27 10:46 UTCEG score recompute
  40. 2026-08-27 10:46 UTCGHSA enrichment
  41. 2026-08-26 14:46 UTCEPSS rescore
  42. 2026-08-26 12:57 UTCGHSA enrichment
  43. 2026-08-25 15:09 UTCEG score recompute
  44. 2026-08-25 15:09 UTCGHSA enrichment
  45. 2026-08-25 13:48 UTCEPSS rescore
  46. 2026-08-24 23:42 UTCEG score recompute
  47. 2026-08-24 23:42 UTCGHSA enrichment
  48. 2026-08-24 01:52 UTCGHSA enrichment
  49. 2026-08-23 03:59 UTCEG score recompute
  50. 2026-08-23 03:59 UTCGHSA enrichment
  51. 2026-08-23 00:19 UTCEPSS rescore
  52. 2026-08-22 06:11 UTCEG score recompute
  53. 2026-08-22 06:10 UTCGHSA enrichment
  54. 2026-08-21 23:49 UTCEPSS rescore
  55. 2026-08-21 08:19 UTCEG score recompute
  56. 2026-08-21 08:19 UTCGHSA enrichment
  57. 2026-08-20 22:55 UTCEPSS rescore
  58. 2026-08-20 10:30 UTCEG score recompute
  59. 2026-08-20 10:30 UTCGHSA enrichment
  60. 2026-08-19 17:03 UTCEPSS rescore
  61. 2026-08-19 12:41 UTCGHSA enrichment
  62. 2026-08-18 14:52 UTCEG score recompute
  63. 2026-08-18 14:52 UTCGHSA enrichment
  64. 2026-08-18 13:48 UTCEPSS rescore
  65. 2026-08-17 16:47 UTCEG score recompute
  66. 2026-08-17 16:47 UTCGHSA enrichment
  67. 2026-08-17 13:47 UTCEPSS rescore
  68. 2026-08-16 18:58 UTCEG score recompute
  69. 2026-08-16 18:58 UTCGHSA enrichment
  70. 2026-08-16 14:56 UTCEPSS rescore
  71. 2026-08-16 02:14 UTCEPSS rescore
  72. 2026-08-15 21:09 UTCEG score recompute
  73. 2026-08-15 21:09 UTCGHSA enrichment
  74. 2026-08-15 01:30 UTCEPSS rescore
  75. 2026-08-14 23:19 UTCEG score recompute

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 25, 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 91.0% of all scored CVEs.
What is the CVSS score of CVE-2026-18728?
CVE-2026-18728 has a CVSS v3 base score of 6.5 (NVD).
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

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