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: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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(2)

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 rangeFix by version rangeDependents
open-iscsi2.1.8-1
  • every version up to 2.1.8-1+deb12u1: fixed in 2.1.8-1+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
open-iscsi2.1.11-1 ... 2.1.13-1 (11 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
open-iscsi2.1.11-1 ... 2.1.12-2 (8 versions)
  • every version up to 2.1.13-1: fixed in 2.1.13-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 86× 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 154 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18728?
CVE-2026-18728 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18728?
A fix for CVE-2026-18728 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18728 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by 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.

Book a Demo →Browse All CVEs