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Vulnerability · Published May 7, 2026 · Assigned by GitHub_M

CVE-2026-42880ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction

Critical 9.6

In plain English

A critical-severity information exposure in argo-cd from argoproj. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.6Critical
Exploit odds (30 days)0.6%top 48.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC

Official 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 & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/argoproj/argo-cdno fix listedGO-2026-5099
Gogithub.com/argoproj/argo-cd/v2no fix listedGO-2026-5099
Gogithub.com/argoproj/argo-cd/v33.2.11GHSA-3v3m-wc6v-x4x3
Gogithub.com/argoproj/argo-cd/v33.3.9GHSA-3v3m-wc6v-x4x3
Gogithub.com/argoproj/argo-cd/v33.2.11, 3.3.9GO-2026-5099

Affected products (as reported)

VendorProductVersions
argoproj argo-cd >= 3.2.0, < 3.2.11>= 3.3.0, < 3.3.9

Weakness: CWE-200, CWE-212, CWE-201 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References