CVE-2026-18726

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. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory corruption or data exposure has been confirmed.

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
11%
KEV
Not listed

Published

August 12, 2026

Last Modified

August 25, 2026

Advisory Details (2)

Auto-updated Aug 12, 2026
Patch available. Sources: redhat.
redhat

2462331 – (CVE-2026-18726) CVE-2026-18726 open-iscsi: open-iscsi: Denial of service in iscsiuio Router Advertisement parsing

https://bugzilla.redhat.com/show_bug.cgi?id=2462331
redhat Patch Available

CVE-2026-18726 - 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-2026-18726

Vendor Advisories for CVE-2026-18726(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 27× in last 7d / 92× 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 121 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-18726?
CVE-2026-18726 is a medium vulnerability published on August 12, 2026. A flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length…
When was CVE-2026-18726 disclosed?
CVE-2026-18726 was first published in the National Vulnerability Database on August 12, 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-2026-18726 actively exploited?
CVE-2026-18726 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 89.0% of all scored CVEs.
What is the CVSS score of CVE-2026-18726?
CVE-2026-18726 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-18726?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18726, 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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