CVE-2026-42880

ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction

State: Published
Severity: 9.6 Critical
Published: May 7, 2026
Updated: Sep 7, 2026
Reserved: Apr 30, 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.

Scores

CVSS	Score	Vector	Source
3.1	9.6 Critical	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N	GitHub_M
3.1	7.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N	redhat-SADP

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-212 Improper Removal of Sensitive Information Before Storage or Transfer
CWE-201 Insertion of Sensitive Information Into Sent Data

Affected Products

Product	Versions
argo-cdargoproj	>= 3.2.0, < 3.2.11Affected >= 3.3.0, < 3.3.9Affected

References

https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3
https://access.redhat.com/security/cve/CVE-2026-42880vdb-entry
RHBZ#2467882issue-tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42880.json
https://access.redhat.com/errata/RHSA-2026:20943vendor-advisory
https://access.redhat.com/errata/RHSA-2026:20947vendor-advisory
https://access.redhat.com/errata/RHBA-2026:12433vendor-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.