CVE-2026-87736

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-09. A secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 4.3Exploit: None knownExposed services: Not assessed

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

An issue was discovered in the mirage-crypto-ec package before 2.3.0 for OCaml. There is an EC public key out-of-bounds read for compressed points.

CVSS v3
4.3
EG Score
4.3MEDIUMhigh confidence
EG Risk
19
EG Risk 19/100CISA 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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
27th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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

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-2026-15

Vendor Advisories for CVE-2026-87736(1)

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
ocaml-mirage-crypto0.10.7-1 ... 2.4.1-1 (19 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ocaml-mirage-crypto2.0.0-1 ... 2.4.1-1 (10 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ocaml-mirage-crypto2.0.0-1 ... 2.2.0-2 (7 versions)
  • every version up to 2.3.0-1: fixed in 2.3.0-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 18× in last 7d / 75× 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. 2026-10-05 04:19 UTCEG score recompute
  2. 2026-10-05 04:19 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 04:02 UTCEG score recompute
  5. 2026-10-04 04:02 UTCGHSA enrichment
  6. 2026-10-03 03:45 UTCEG score recompute
  7. 2026-10-03 03:45 UTCGHSA enrichment
  8. 2026-10-02 03:28 UTCEG score recompute
  9. 2026-10-02 03:28 UTCGHSA enrichment
  10. 2026-10-01 19:51 UTCEPSS rescore
  11. 2026-10-01 03:05 UTCEG score recompute
  12. 2026-10-01 03:05 UTCGHSA enrichment
  13. 2026-09-30 15:04 UTCEPSS rescore
  14. 2026-09-30 02:48 UTCEG score recompute
  15. 2026-09-30 02:48 UTCGHSA enrichment
  16. 2026-09-29 02:32 UTCEG score recompute
  17. 2026-09-29 02:32 UTCGHSA enrichment
  18. 2026-09-28 13:52 UTCEPSS rescore
  19. 2026-09-28 02:15 UTCEG score recompute
  20. 2026-09-28 02:15 UTCGHSA enrichment
  21. 2026-09-27 13:48 UTCEPSS rescore
  22. 2026-09-27 01:58 UTCEG score recompute
  23. 2026-09-27 01:58 UTCGHSA enrichment
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-26 01:31 UTCEG score recompute
Show 50 more
  1. 2026-09-26 01:31 UTCGHSA enrichment
  2. 2026-09-25 00:04 UTCEG score recompute
  3. 2026-09-25 00:04 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-23 23:23 UTCEG score recompute
  6. 2026-09-23 23:23 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-22 22:30 UTCEG score recompute
  9. 2026-09-22 22:30 UTCGHSA enrichment
  10. 2026-09-22 16:01 UTCEPSS rescore
  11. 2026-09-21 22:10 UTCEG score recompute
  12. 2026-09-21 22:10 UTCGHSA enrichment
  13. 2026-09-21 21:09 UTCEPSS rescore
  14. 2026-09-20 21:54 UTCEG score recompute
  15. 2026-09-20 21:54 UTCGHSA enrichment
  16. 2026-09-20 20:16 UTCEPSS rescore
  17. 2026-09-19 21:37 UTCEG score recompute
  18. 2026-09-19 21:37 UTCGHSA enrichment
  19. 2026-09-18 21:20 UTCEG score recompute
  20. 2026-09-18 21:20 UTCGHSA enrichment
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-17 20:15 UTCEG score recompute
  23. 2026-09-17 20:15 UTCGHSA enrichment
  24. 2026-09-17 19:32 UTCEPSS rescore
  25. 2026-09-16 18:12 UTCEG score recompute
  26. 2026-09-16 18:12 UTCGHSA enrichment
  27. 2026-09-16 14:09 UTCEPSS rescore
  28. 2026-09-16 05:15 UTCEPSS rescore
  29. 2026-09-15 16:43 UTCEG score recompute
  30. 2026-09-15 16:43 UTCGHSA enrichment
  31. 2026-09-15 03:12 UTCEPSS rescore
  32. 2026-09-14 16:26 UTCEG score recompute
  33. 2026-09-14 16:26 UTCGHSA enrichment
  34. 2026-09-14 15:50 UTCEG score recompute
  35. 2026-09-14 15:50 UTCGHSA enrichment
  36. 2026-09-13 17:16 UTCEG score recompute
  37. 2026-09-13 17:16 UTCGHSA enrichment
  38. 2026-09-12 16:59 UTCEG score recompute
  39. 2026-09-12 16:59 UTCGHSA enrichment
  40. 2026-09-11 16:43 UTCEG score recompute
  41. 2026-09-11 16:43 UTCGHSA enrichment
  42. 2026-09-11 14:53 UTCEPSS rescore
  43. 2026-09-11 14:53 UTCEPSS rescore
  44. 2026-09-10 16:26 UTCEG score recompute
  45. 2026-09-10 16:26 UTCGHSA enrichment
  46. 2026-09-09 16:08 UTCEG score recompute
  47. 2026-09-09 16:08 UTCGHSA enrichment
  48. 2026-09-09 05:25 UTCEG score recompute
  49. 2026-09-09 04:26 UTCEG score recompute
  50. 2026-09-09 04:26 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87736?
CVE-2026-87736 is a medium vulnerability published on September 9, 2026. An issue was discovered in the mirage-crypto-ec package before 2.3.0 for OCaml. There is an EC public key out-of-bounds read for compressed points.
When was CVE-2026-87736 disclosed?
CVE-2026-87736 was first published 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-2026-87736 actively exploited?
CVE-2026-87736 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-87736?
CVE-2026-87736 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-87736?
No fix for CVE-2026-87736 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-87736 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-87736

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