---
cve: "CVE-2026-89136"
severity: "HIGH"
cvss: 8.3
epss: "0.5%"
vendor: "wolfSSL"
kev: false
exploited: false
published: "2026-09-27 09:12:39"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-30T09:52:27+02:00"
---

# CVE-2026-89136

> 8.3 HIGH · 🧪 PoC

## Beschreibung

When using RPK (Raw Public Key), the client side of a TLS 1.2, 1.3 and DTLS 1.2 connection could accept an unsolicited server_cert_type=RawPublicKey which allowed a malicious or misbehaving server to bypass authentication. RPK is off by default and only enabled in --enable-rpk OR --enable-all OR --enable-distro AKA HAVE_RPK builds.

## CNA-Record (Kanon, cvelistV5)

- CNA: **wolfSSL**
- State: PUBLISHED
- Stand: 2026-09-29 16:39:15
- CNA-CVSS: **8.3** (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

- <https://github.com/wolfSSL/wolfssl/pull/11009>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89136) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_