CVE-2026-87734

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
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: Elevated riskExposed: 0

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

An issue was discovered in the utcp package before 0.0.6 for OCaml. Out-of-order segment reassembly allows remote denial of service.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/OSEC-2026-11

Vendor Advisories for CVE-2026-87734(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 28× in last 7d / 42× 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 21:52 UTCEG score recompute
  2. 2026-09-18 21:52 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 09:04 UTCGHSA enrichment
  5. 2026-09-17 20:15 UTCEG score recompute
  6. 2026-09-17 20:15 UTCGHSA enrichment
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-17 07:02 UTCGHSA enrichment
  9. 2026-09-16 18:12 UTCEG score recompute
  10. 2026-09-16 18:12 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 04:24 UTCGHSA enrichment
  14. 2026-09-15 15:20 UTCEG score recompute
  15. 2026-09-15 15:20 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 02:30 UTCEG score recompute
  18. 2026-09-15 02:30 UTCGHSA enrichment
  19. 2026-09-14 13:37 UTCEG score recompute
  20. 2026-09-14 13:37 UTCGHSA enrichment
  21. 2026-09-14 13:10 UTCEG score recompute
  22. 2026-09-14 13:10 UTCGHSA enrichment
  23. 2026-09-14 11:30 UTCGHSA enrichment
  24. 2026-09-13 22:41 UTCEG score recompute
  25. 2026-09-13 22:41 UTCGHSA enrichment
Show 17 more
  1. 2026-09-13 09:52 UTCGHSA enrichment
  2. 2026-09-12 21:02 UTCEG score recompute
  3. 2026-09-12 21:02 UTCGHSA enrichment
  4. 2026-09-12 08:13 UTCGHSA enrichment
  5. 2026-09-11 19:24 UTCEG score recompute
  6. 2026-09-11 19:24 UTCGHSA enrichment
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 06:35 UTCGHSA enrichment
  10. 2026-09-10 17:46 UTCEG score recompute
  11. 2026-09-10 17:46 UTCGHSA enrichment
  12. 2026-09-10 04:57 UTCGHSA enrichment
  13. 2026-09-09 16:08 UTCEG score recompute
  14. 2026-09-09 16:08 UTCGHSA enrichment
  15. 2026-09-09 05:25 UTCEG score recompute
  16. 2026-09-09 04:26 UTCEG score recompute
  17. 2026-09-09 04:26 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-87734?
CVE-2026-87734 is a high vulnerability published on September 9, 2026. An issue was discovered in the utcp package before 0.0.6 for OCaml. Out-of-order segment reassembly allows remote denial of service.
When was CVE-2026-87734 disclosed?
CVE-2026-87734 was first published in the National Vulnerability Database on September 9, 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-2026-87734 actively exploited?
CVE-2026-87734 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 78.2% of all scored CVEs.
What is the CVSS score of CVE-2026-87734?
CVE-2026-87734 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-87734?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87734, 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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