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

A fix is available — apply it.

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
6.5MEDIUMmedium 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
9th
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 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(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 17× in last 7d / 90× 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 161 total refreshes for this CVE.

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

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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 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 0.2% probability of exploitation in the next 30 days (9th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18726?
CVE-2026-18726 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-2026-18726?
A fix for CVE-2026-18726 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18726 are linked in the Vendor Advisories panel on this page.

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