CVE-2026-42880 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-42880CRITICAL

argoproj argo-cd — ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  C  H  H  N    9.6   .0051   41.1     —

AFFECTED
  Product  Versions              Fixed
  argo-cd  >= 3.2.0, < 3.2.11 –  —

TIMELINE
  Apr 30  Reserved by GitHub_M
  May 7   Published (CNA: GitHub_M)
  Aug 17  EXPLOIT PUBLISHED — CVE-2026-42880 (argoproj argo-cd). Public exploit reference added.

CWE-200, CWE-212 · CNA: GitHub_M · CVSS v3.1 · 7 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 30, 2026	Reserved	Reserved by GitHub_M
May 7, 2026	Published	Published (CNA: GitHub_M)
August 17, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-42880 (argoproj argo-cd). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
argoproj	argo-cd	—	>= 3.2.0, < 3.2.11	—

Weaknesses

CWE-200 · CWE-212

References (7)

https://access.redhat.com/errata/RHBA-2026:12433 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2026:20943 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2026:20947 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/security/cve/CVE-2026-42880 [vdb-entry, x_refsource_REDHAT]
https://bugzilla.redhat.com/show_bug.cgi?id=2467882 [issue-tracking, x_refsource_REDHAT]
https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3 [x_refsource_CONFIRM]
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42880.json [x_sadp-csaf-vex]

Authoritative record: CVE-2026-42880 at cve.org

Vendors: argoproj

Weaknesses: CWE-200 · CWE-212

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-42880 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.