CVE-2026-89086

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-10. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
Patch available. Sources: github_commit.
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/OSEC-2026-19
github_commit Patch Available

commit cf17d991ec6a (ulrikstrid/ocaml-jose)

Patch available: ulrikstrid/ocaml-jose 0.11.0 (contains commit cf17d991ec6a)

https://github.com/ulrikstrid/ocaml-jose/commit/cf17d991ec6a0d1997956b6c7799890f9c28879e

Vendor Advisories for CVE-2026-89086(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 55× in last 7d / 77× 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 22:19 UTCGHSA enrichment
  2. 2026-09-19 18:28 UTCEG score recompute
  3. 2026-09-19 18:28 UTCGHSA enrichment
  4. 2026-09-19 14:36 UTCGHSA enrichment
  5. 2026-09-19 10:44 UTCGHSA enrichment
  6. 2026-09-19 06:50 UTCGHSA enrichment
  7. 2026-09-19 02:52 UTCGHSA enrichment
  8. 2026-09-18 23:01 UTCEG score recompute
  9. 2026-09-18 23:01 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 19:10 UTCGHSA enrichment
  12. 2026-09-18 15:18 UTCGHSA enrichment
  13. 2026-09-18 11:27 UTCGHSA enrichment
  14. 2026-09-18 07:36 UTCGHSA enrichment
  15. 2026-09-18 03:45 UTCGHSA enrichment
  16. 2026-09-17 23:54 UTCGHSA enrichment
  17. 2026-09-17 19:46 UTCEG score recompute
  18. 2026-09-17 19:46 UTCGHSA enrichment
  19. 2026-09-17 19:32 UTCEPSS rescore
  20. 2026-09-17 13:48 UTCGHSA enrichment
  21. 2026-09-17 09:57 UTCGHSA enrichment
  22. 2026-09-17 06:06 UTCGHSA enrichment
  23. 2026-09-17 02:15 UTCGHSA enrichment
  24. 2026-09-16 22:23 UTCGHSA enrichment
  25. 2026-09-16 18:08 UTCEG score recompute
Show 52 more
  1. 2026-09-16 18:08 UTCGHSA enrichment
  2. 2026-09-16 14:09 UTCEPSS rescore
  3. 2026-09-16 12:44 UTCGHSA enrichment
  4. 2026-09-16 08:52 UTCEG score recompute
  5. 2026-09-16 08:52 UTCGHSA enrichment
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-16 05:01 UTCGHSA enrichment
  8. 2026-09-16 01:08 UTCGHSA enrichment
  9. 2026-09-15 21:17 UTCGHSA enrichment
  10. 2026-09-15 17:25 UTCGHSA enrichment
  11. 2026-09-15 13:34 UTCGHSA enrichment
  12. 2026-09-15 09:42 UTCGHSA enrichment
  13. 2026-09-15 05:51 UTCEG score recompute
  14. 2026-09-15 05:51 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-15 01:59 UTCGHSA enrichment
  17. 2026-09-14 22:08 UTCGHSA enrichment
  18. 2026-09-14 18:15 UTCGHSA enrichment
  19. 2026-09-14 14:01 UTCGHSA enrichment
  20. 2026-09-14 10:09 UTCGHSA enrichment
  21. 2026-09-14 06:18 UTCGHSA enrichment
  22. 2026-09-14 02:27 UTCGHSA enrichment
  23. 2026-09-13 22:36 UTCGHSA enrichment
  24. 2026-09-13 18:45 UTCEG score recompute
  25. 2026-09-13 18:45 UTCGHSA enrichment
  26. 2026-09-13 16:48 UTCEPSS rescore
  27. 2026-09-13 14:54 UTCGHSA enrichment
  28. 2026-09-13 11:02 UTCGHSA enrichment
  29. 2026-09-13 07:10 UTCGHSA enrichment
  30. 2026-09-13 03:19 UTCGHSA enrichment
  31. 2026-09-12 23:27 UTCGHSA enrichment
  32. 2026-09-12 19:36 UTCGHSA enrichment
  33. 2026-09-12 15:45 UTCEG score recompute
  34. 2026-09-12 15:45 UTCGHSA enrichment
  35. 2026-09-12 15:02 UTCEPSS rescore
  36. 2026-09-12 11:53 UTCGHSA enrichment
  37. 2026-09-12 08:02 UTCGHSA enrichment
  38. 2026-09-12 04:11 UTCGHSA enrichment
  39. 2026-09-12 00:19 UTCGHSA enrichment
  40. 2026-09-11 20:27 UTCGHSA enrichment
  41. 2026-09-11 16:36 UTCEG score recompute
  42. 2026-09-11 16:36 UTCGHSA enrichment
  43. 2026-09-11 14:53 UTCEPSS rescore
  44. 2026-09-11 14:53 UTCEPSS rescore
  45. 2026-09-11 12:44 UTCGHSA enrichment
  46. 2026-09-11 08:52 UTCGHSA enrichment
  47. 2026-09-11 05:01 UTCGHSA enrichment
  48. 2026-09-11 01:10 UTCEG score recompute
  49. 2026-09-11 01:10 UTCGHSA enrichment
  50. 2026-09-10 20:18 UTCEG score recompute
  51. 2026-09-10 20:00 UTCEG score recompute
  52. 2026-09-10 19:59 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-89086?
CVE-2026-89086 is a critical vulnerability published on September 10, 2026. In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.
When was CVE-2026-89086 disclosed?
CVE-2026-89086 was first published in the National Vulnerability Database 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-2026-89086 actively exploited?
CVE-2026-89086 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 90.1% of all scored CVEs.
What is the CVSS score of CVE-2026-89086?
CVE-2026-89086 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-89086?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89086, 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-2026-89086

Explore →

Is Your Infrastructure Affected by CVE-2026-89086?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs