CVE-2026-18858

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 99% 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
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: 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, and 7.5 could allow a local authenticated attacker to obtain information from a privileged file when using SSH.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Sep 8, 2026
No patch confirmed yet.
generic

Security Bulletin: IBM i is Affected By Obtaining Sensitive Information Vulnerability in OpenSSH [CVE-2026-18858]

https://www.ibm.com/support/pages/node/7285938

Vendor Advisories for CVE-2026-18858(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 15× in last 7d / 39× 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. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-18 13:10 UTCEG score recompute
  3. 2026-09-18 13:10 UTCGHSA enrichment
  4. 2026-09-17 11:29 UTCEG score recompute
  5. 2026-09-17 11:28 UTCGHSA enrichment
  6. 2026-09-16 14:07 UTCEPSS rescore
  7. 2026-09-16 09:45 UTCEG score recompute
  8. 2026-09-16 09:45 UTCGHSA enrichment
  9. 2026-09-16 05:14 UTCEPSS rescore
  10. 2026-09-15 08:03 UTCEG score recompute
  11. 2026-09-15 08:03 UTCGHSA enrichment
  12. 2026-09-14 06:21 UTCGHSA enrichment
  13. 2026-09-13 04:40 UTCEG score recompute
  14. 2026-09-13 04:40 UTCGHSA enrichment
  15. 2026-09-12 15:00 UTCEPSS rescore
  16. 2026-09-12 02:59 UTCEG score recompute
  17. 2026-09-12 02:59 UTCGHSA enrichment
  18. 2026-09-11 14:52 UTCEPSS rescore
  19. 2026-09-11 09:36 UTCEPSS rescore
  20. 2026-09-11 01:17 UTCEG score recompute
  21. 2026-09-11 01:17 UTCGHSA enrichment
  22. 2026-09-10 09:34 UTCEPSS rescore
  23. 2026-09-09 23:36 UTCEG score recompute
  24. 2026-09-09 23:36 UTCGHSA enrichment
  25. 2026-09-08 22:00 UTCEPSS rescore
Show 14 more
  1. 2026-09-08 21:55 UTCEG score recompute▲ 2.20
  2. 2026-09-08 21:54 UTCGHSA enrichment
  3. 2026-09-08 21:47 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  4. 2026-09-08 19:57 UTCEG score recompute
  5. 2026-09-08 19:57 UTCGHSA enrichment
  6. 2026-09-08 18:16 UTCEG score recompute
  7. 2026-09-08 18:16 UTCGHSA enrichment
  8. 2026-09-08 15:15 UTCGHSA enrichment
  9. 2026-09-07 22:52 UTCEG score recompute
  10. 2026-09-07 22:52 UTCGHSA enrichment
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-04 16:19 UTCEG score recompute
  14. 2026-09-04 16:19 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18858?
CVE-2026-18858 is a medium vulnerability published on September 4, 2026. IBM i 7.6, and 7.5 could allow a local authenticated attacker to obtain information from a privileged file when using SSH.
When was CVE-2026-18858 disclosed?
CVE-2026-18858 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18858 actively exploited?
CVE-2026-18858 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 99.2% of all scored CVEs.
What is the CVSS score of CVE-2026-18858?
CVE-2026-18858 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-18858?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18858, 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-2026-18858

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