What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-07 · updated 2026-10-26
• Weakness: CWE-200

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: from 3.2.0 before 3.2.11; from 3.3.0 before 3.3.9 — fixed in 3.2.11, 3.3.9

How to fix

Upgrade to a fixed version: argoproj argo-cd 3.2.11, 3.3.9. Check the vendor advisory for mitigations.

References

• 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://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42880.json

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