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Fencer Intel
critical 9.6

CVE-2026-42880 json

ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction

published 6mo ago modified 14d ago also BIT-argo-cd-2026-42880 , CVE-2026-43824 , EUVD-2026-28469 , GHSA-3v3m-wc6v-x4x3 , GO-2026-5099

cvss
9.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/argoproj/argo-cd/v3 3.2.11, 3.3.9
  • bitnami argo-cd 3.2.11, 3.3.9
  • Red Hat Red Hat OpenShift GitOps 1.19 1779211412
  • Red Hat Red Hat OpenShift GitOps 1.20 1776942799, 1779284685, 1779285074, 1779285564
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-42880 updated cvss 7.7

argoproj/argo-cd: Argo CD: Information disclosure of Kubernetes Secret data via Server-Side Apply dry-run mechanism

  • Red Hat Openshift Data Foundation 4 odf4/odf-multicluster-rhel9-operator
    affected: workaround, no fix available
  • Red Hat OpenShift GitOps 1.19 openshift-gitops-1/argocd-image-updater-rhel8 1779211412
    fixed: vendor fix RHSA-2026:20943
  • Red Hat OpenShift GitOps 1.20 openshift-gitops-1 1776942799, openshift-gitops-1/argocd-agent-rhel9 1779285564, openshift-gitops-1/gitops-rhel9-operator 1779284685, openshift-gitops-1/argocd-image-updater-rhel9 1779285074
    fixed: vendor fix RHSA-2026:20947
  • Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/gitops-rhel8, openshift-gitops-1/gitops-rhel9, openshift-gitops-1/argocd-agent-rhel8, openshift-gitops-1/gitops-rhel8-operator Red Hat OpenShift GitOps 1.19 openshift-gitops-1/dex-rhel8 1779209965, openshift-gitops-1/argocd-rhel8 1779211724, openshift-gitops-1/argocd-rhel9 1779211476, openshift-gitops-1/gitops-rhel8 1779210473, openshift-gitops-1/must-gather-rhel8 1779209869, openshift-gitops-1/argocd-agent-rhel8 1779210454, +5 more Red Hat OpenShift GitOps 1.20 openshift-gitops-1 1776941318, openshift-gitops-1 1776941552, openshift-gitops-1 1776941720, openshift-gitops-1 1776941765, openshift-gitops-1 1776941836, openshift-gitops-1 1776941989, +12 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
5mo ago

Exploit prediction

0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CISA ADP 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
GitHub 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
OSV 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/argoproj/argo-cd/v3
>=3.2.0, <3.2.11
>=3.3.0, <3.3.9
3.2.11
3.3.9
bitnami argo-cd
>=3.2.0, <3.2.11
>=3.3.0, <3.3.9
3.2.11
3.3.9
go github.com/argoproj/argo-cd
all versions
 no fix listed
go github.com/argoproj/argo-cd/v2
all versions
 no fix listed

Affected products

  • argoproj argo-cd
  • Red Hat Red Hat OpenShift GitOps 1.19
  • Red Hat Red Hat OpenShift GitOps 1.20
  • Red Hat Red Hat Openshift Data Foundation 4
  • Red Hat Red Hat OpenShift GitOps

Classification

Weakness
  • 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

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.