---
cve: "CVE-2026-89086"
severity: "CRITICAL"
cvss: 9.1
epss: "0.2%"
vendor: "OCaml"
kev: false
exploited: false
published: "2026-09-10 20:17:32"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T14:46:56+02:00"
---

# CVE-2026-89086

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- a4a060bf4888d858566b798397815440e0c426c9 (Commit)
- cf17d991ec6a0d1997956b6c7799890f9c28879e (Commit)

## Referenzen

- <https://github.com/ulrikstrid/ocaml-jose/commit/cf17d991ec6a0d1997956b6c7799890f9c28879e>
- <https://osv.dev/vulnerability/OSEC-2026-19>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89086) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_