CVE-2026-42880

CRITICAL9.6EPSS 0.01%

ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction

Published: 5/7/2026Modified: 5/11/2026

Also known as:GHSA-3v3m-wc6v-x4x3BIT-argo-cd-2026-42880CGA-2mjh-4vq8-rqg6

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 packages (2)

Bitnami/argo-cd>= 3.2.0, < 3.2.11, >= 3.3.0, < 3.3.9
Go/github.com/argoproj/argo-cd/v3>= 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

References (3)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-42880
PATCHhttps://github.com/argoproj/argo-cd
WEBhttps://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3