---
cve: "CVE-2026-56864"
severity: "HIGH"
cvss: 7.5
epss: "25%"
vendor: "Go toolchain"
kev: false
exploited: false
published: "2026-08-13 22:17:22"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T08:19:25+02:00"
---

# CVE-2026-56864

> 7.5 HIGH

## Beschreibung

A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency log. This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content that cannot be detected by evaluating the transparency log. In order to determine if you have been affected:   rm -r go.sum go.work.sum vendor/ && go mod tidy

## CVSS-Vektor

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

## Referenzen

- <https://go.dev/issue/80745>
- <https://groups.google.com/g/golang-announce/c/94pEornpRlI>
- <https://go.dev/cl/815000>
- <https://go.dev/cl/815020>
- <https://pkg.go.dev/vuln/GO-2026-6180>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56864) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_