---
cve: "CVE-2026-27138"
severity: "MEDIUM"
cvss: 5.9
epss: "35%"
vendor: "Go standard library"
kev: false
exploited: false
published: "2026-03-06 22:16:00"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T17:27:57+02:00"
---

# CVE-2026-27138

> 5.9 MEDIUM

## Beschreibung

Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.

## CVSS-Vektor

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

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

## Referenzen

- <https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk>
- <https://go.dev/issue/77953>
- <https://go.dev/cl/752183>
- <https://pkg.go.dev/vuln/GO-2026-4600>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-27138) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_