---
cve: "CVE-2026-42505"
severity: "MEDIUM"
cvss: 5.3
epss: "38%"
vendor: "Go standard library"
kev: false
exploited: false
published: "2026-07-08 17:17:21"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-09T02:18:01+02:00"
---

# CVE-2026-42505

> 5.3 MEDIUM

## Beschreibung

Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- d80d9a98f7e3a8f9b3a82d2c6079f84eb1101d46 (Commit)
- c19862e5f8415b4f24b189d065ed739517c548ba (Commit)

## Referenzen

- <https://go.dev/cl/775960>
- <https://go.dev/issue/79282>
- <https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc>
- <https://pkg.go.dev/vuln/GO-2026-5856>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42505) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_