---
cve: "CVE-2026-39833"
severity: "CRITICAL"
cvss: 9.1
epss: "41%"
vendor: "golang.org/x/crypto"
kev: false
exploited: false
published: "2026-05-22 04:16:22"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T01:16:23+02:00"
---

# CVE-2026-39833

> 9.1 CRITICAL

## Beschreibung

The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.

## 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)

- a1c0d9929856c8aba2b31f079340f00578eda803 (Commit)

## Referenzen

- <https://go.dev/issue/79436>
- <https://go.dev/cl/778642>
- <https://groups.google.com/g/golang-announce/c/a082jnz-LvI>
- <https://pkg.go.dev/vuln/GO-2026-5005>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-39833) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_