CVE-2026-42880
ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction
9.6
CRITICAL
CVSS 3.1
EPSS 0.01%
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.
How to fix CVE-2026-42880
To remediate CVE-2026-42880, upgrade the affected package to a fixed version below.
- —upgrade to 3.2.11 or later
- —upgrade to 3.2.11 or later
Is CVE-2026-42880 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 3.2.0, < 3.2.11, >= 3.3.0, < 3.3.9
- >= 3.2.0, < 3.2.11
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.6 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N |