CVE-2026-89087

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-09-10. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0

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

The cstruct package before 6.3.0 for OCaml mishandles indexes.

CVSS v3
7.3
EG Score
7.3(high)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity73% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 10, 2026
No patch confirmed yet.
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/OSEC-2026-20

Vendor Advisories for CVE-2026-89087(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 31× in last 7d / 40× 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. 2026-09-19 01:36 UTCEG score recompute
  2. 2026-09-19 01:36 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 13:57 UTCGHSA enrichment
  5. 2026-09-18 02:10 UTCEG score recompute
  6. 2026-09-18 02:10 UTCGHSA enrichment
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-17 14:30 UTCGHSA enrichment
  9. 2026-09-17 02:48 UTCGHSA enrichment
  10. 2026-09-16 15:07 UTCEG score recompute
  11. 2026-09-16 15:07 UTCGHSA enrichment
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-16 03:26 UTCGHSA enrichment
  15. 2026-09-15 15:46 UTCGHSA enrichment
  16. 2026-09-15 04:06 UTCEG score recompute
  17. 2026-09-15 04:06 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 16:26 UTCEG score recompute
  20. 2026-09-14 16:26 UTCGHSA enrichment
  21. 2026-09-14 15:50 UTCEG score recompute
  22. 2026-09-14 15:50 UTCGHSA enrichment
  23. 2026-09-14 05:56 UTCGHSA enrichment
  24. 2026-09-13 18:16 UTCEG score recompute
  25. 2026-09-13 18:16 UTCGHSA enrichment
Show 15 more
  1. 2026-09-13 16:48 UTCEPSS rescore
  2. 2026-09-13 06:36 UTCGHSA enrichment
  3. 2026-09-12 18:57 UTCEG score recompute
  4. 2026-09-12 18:57 UTCGHSA enrichment
  5. 2026-09-12 15:02 UTCEPSS rescore
  6. 2026-09-12 07:17 UTCGHSA enrichment
  7. 2026-09-11 19:38 UTCEG score recompute
  8. 2026-09-11 19:38 UTCGHSA enrichment
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 07:58 UTCEG score recompute
  12. 2026-09-11 07:58 UTCGHSA enrichment
  13. 2026-09-10 20:18 UTCEG score recompute
  14. 2026-09-10 20:00 UTCEG score recompute
  15. 2026-09-10 19:59 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-89087?
CVE-2026-89087 is a high vulnerability published on September 10, 2026. The cstruct package before 6.3.0 for OCaml mishandles indexes.
When was CVE-2026-89087 disclosed?
CVE-2026-89087 was first published in the National Vulnerability Database on September 10, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89087 actively exploited?
CVE-2026-89087 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 91.4% of all scored CVEs.
What is the CVSS score of CVE-2026-89087?
CVE-2026-89087 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-89087?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89087, 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-2026-89087

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