---
cve: "CVE-2026-42880"
severity: "CRITICAL"
cvss: 9.6
epss: "51%"
vendor: "argoproj"
kev: false
exploited: false
published: "2026-05-07 23:16:32"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T13:27:21+02:00"
---

# CVE-2026-42880

> 9.6 CRITICAL · 🧪 PoC

## Beschreibung

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From versions 3.2.0 to before 3.2.11 and 3.3.0 to before 3.3.9, there is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext Kubernetes Secret data from etcd via the Kubernetes API server's Server-Side Apply dry-run mechanism. This issue has been patched in versions 3.2.11 and 3.3.9.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 6d66c1b29e4f25dccfb5b0c7a939785b0071ef9a (Commit)
- 1b1bb48f981385cf40b282e965cf63419be3d93f (Commit)

## Referenzen

- <https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3>
- <https://access.redhat.com/errata/RHBA-2026:12433>
- <https://access.redhat.com/errata/RHSA-2026:20943>
- <https://access.redhat.com/errata/RHSA-2026:20947>
- <https://access.redhat.com/security/cve/CVE-2026-42880>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2467882>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42880.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42880) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_