# CVE-2026-42880

## Summary

- **CVE ID:** CVE-2026-42880
- **Severity:** CRITICAL
- **CVSS Score:** 9.6 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N)
- **CWE:** CWE-200, CWE-212
- **Published:** May 7, 2026
- **Last Modified:** Sep 7, 2026

## Description

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.

## Affected Products

- argoproj — argo-cd (>= 3.2.0, < 3.2.11)
- argoproj — argo-cd (>= 3.3.0, < 3.3.9)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.51%
- **EPSS Percentile:** 41.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._