CVE-2026-17255

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 68% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to improper validation of the prefix length in ICMPv6 Router Advertisements.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 10, 2026

Advisory Details (1)

Auto-updated Sep 4, 2026
No patch confirmed yet.
generic

Security Bulletin: IBM i is Affected By Denial of Service Vulnerability [CVE-2026-17255]

https://www.ibm.com/support/pages/node/7286093

Vendor Advisories for CVE-2026-17255(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 / 80× 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. 2026-09-25 08:53 UTCGHSA enrichment
  2. 2026-09-24 21:56 UTCEG score recompute
  3. 2026-09-24 21:56 UTCGHSA enrichment
  4. 2026-09-24 10:22 UTCGHSA enrichment
  5. 2026-09-23 23:25 UTCEG score recompute
  6. 2026-09-23 23:25 UTCGHSA enrichment
  7. 2026-09-23 11:51 UTCGHSA enrichment
  8. 2026-09-23 00:54 UTCEG score recompute
  9. 2026-09-23 00:54 UTCGHSA enrichment
  10. 2026-09-22 13:57 UTCGHSA enrichment
  11. 2026-09-22 03:01 UTCEG score recompute
  12. 2026-09-22 03:01 UTCGHSA enrichment
  13. 2026-09-21 16:03 UTCGHSA enrichment
  14. 2026-09-21 05:06 UTCEG score recompute
  15. 2026-09-21 05:06 UTCGHSA enrichment
  16. 2026-09-20 18:07 UTCGHSA enrichment
  17. 2026-09-20 07:10 UTCGHSA enrichment
  18. 2026-09-19 19:50 UTCEG score recompute
  19. 2026-09-19 19:50 UTCGHSA enrichment
  20. 2026-09-19 08:53 UTCGHSA enrichment
  21. 2026-09-18 21:50 UTCEG score recompute
  22. 2026-09-18 21:50 UTCGHSA enrichment
  23. 2026-09-18 19:27 UTCEPSS rescore
  24. 2026-09-18 10:54 UTCGHSA enrichment
  25. 2026-09-17 23:57 UTCEG score recompute
Show 55 more
  1. 2026-09-17 23:57 UTCGHSA enrichment
  2. 2026-09-17 13:00 UTCGHSA enrichment
  3. 2026-09-17 01:36 UTCGHSA enrichment
  4. 2026-09-16 14:39 UTCEG score recompute
  5. 2026-09-16 14:39 UTCGHSA enrichment
  6. 2026-09-16 14:07 UTCEPSS rescore
  7. 2026-09-16 05:14 UTCEPSS rescore
  8. 2026-09-16 03:41 UTCGHSA enrichment
  9. 2026-09-15 16:44 UTCGHSA enrichment
  10. 2026-09-15 05:47 UTCEG score recompute
  11. 2026-09-15 05:47 UTCGHSA enrichment
  12. 2026-09-14 18:49 UTCGHSA enrichment
  13. 2026-09-14 07:52 UTCGHSA enrichment
  14. 2026-09-13 20:56 UTCEG score recompute
  15. 2026-09-13 20:56 UTCGHSA enrichment
  16. 2026-09-13 16:46 UTCEPSS rescore
  17. 2026-09-13 09:59 UTCGHSA enrichment
  18. 2026-09-12 23:02 UTCEG score recompute
  19. 2026-09-12 23:02 UTCGHSA enrichment
  20. 2026-09-12 15:00 UTCEPSS rescore
  21. 2026-09-12 12:05 UTCGHSA enrichment
  22. 2026-09-12 01:08 UTCEG score recompute
  23. 2026-09-12 01:08 UTCGHSA enrichment
  24. 2026-09-11 14:52 UTCEPSS rescore
  25. 2026-09-11 14:11 UTCEG score recompute
  26. 2026-09-11 14:11 UTCGHSA enrichment
  27. 2026-09-11 09:36 UTCEPSS rescore
  28. 2026-09-11 03:14 UTCGHSA enrichment
  29. 2026-09-10 16:17 UTCGHSA enrichment
  30. 2026-09-10 15:27 UTCEG score recompute
  31. 2026-09-10 15:27 UTCGHSA enrichment
  32. 2026-09-10 14:14 UTCEG score recompute
  33. 2026-09-10 14:14 UTCGHSA enrichment
  34. 2026-09-10 09:34 UTCEPSS rescore
  35. 2026-09-10 03:17 UTCGHSA enrichment
  36. 2026-09-09 16:20 UTCGHSA enrichment
  37. 2026-09-09 05:12 UTCEG score recompute
  38. 2026-09-09 05:12 UTCGHSA enrichment
  39. 2026-09-08 22:00 UTCEPSS rescore
  40. 2026-09-08 18:16 UTCEG score recompute▲ 3.20
  41. 2026-09-08 18:16 UTCGHSA enrichment
  42. 2026-09-08 17:28 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  43. 2026-09-08 15:13 UTCGHSA enrichment
  44. 2026-09-08 13:23 UTCEG score recompute
  45. 2026-09-08 13:23 UTCGHSA enrichment
  46. 2026-09-07 16:01 UTCEPSS rescore
  47. 2026-09-07 14:37 UTCGHSA enrichment
  48. 2026-09-06 14:54 UTCEG score recompute
  49. 2026-09-06 14:54 UTCGHSA enrichment
  50. 2026-09-06 13:47 UTCEPSS rescore
  51. 2026-09-05 16:10 UTCEG score recompute
  52. 2026-09-05 16:10 UTCGHSA enrichment
  53. 2026-09-04 17:26 UTCEG score recompute
  54. 2026-09-04 16:44 UTCEG score recompute
  55. 2026-09-04 16:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-17255?
CVE-2026-17255 is a high vulnerability published on September 4, 2026. IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to improper validation of the prefix length in ICMPv6 Router Advertisements.
When was CVE-2026-17255 disclosed?
CVE-2026-17255 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-17255 actively exploited?
CVE-2026-17255 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 68.1% of all scored CVEs.
What is the CVSS score of CVE-2026-17255?
CVE-2026-17255 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-17255?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-17255, 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-2026-17255

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