CVE-2026-42880: Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes

Q: How do I fix CVE-2026-42880?

argo cd: upgrade to 3.2.11, 3.3.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-42880 being exploited?

CVE-2026-42880 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42880 affect?

CVE-2026-42880 affects argo cd. Severity is critical (CVSS 9.6). 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

Q: How urgent is CVE-2026-42880?

Priority 56/100. Critical severity; Public exploit reference; On your watchlist

This month

CRITICAL 9.6WATCHLISTUPGRADE

CVE-2026-42880 is a critical-severity flaw (CVSS 9.6) affecting argo cd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-200, CWE-212, CWE-201
Published	2026-05-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: argoproj

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-07 23:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

argoproj argo cd UPGRADE

Affected: >= 3.2.0 and < 3.2.11 · >= 3.3.0 and < 3.3.9

Fixed in: 3.2.11, 3.3.9

Safe to downgrade to: a release before 3.2.0

1. Check installed version

apt-cache policy argo-cd || rpm -q argo-cd || argo-cd --version

2. UPGRADE to 3.2.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade argo-cd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade argo-cd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.2.0 (Debian / Ubuntu)

apt-cache madison argo-cd sudo apt install argo-cd=<VERSION_BEFORE_3.2.0> sudo apt-mark hold argo-cd

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list argo-cd sudo dnf downgrade argo-cd-<VERSION_BEFORE_3.2.0> sudo dnf versionlock add argo-cd

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Go · github.com/argoproj/argo-cd/v3 · FIXED · 3.2.11 · vulnerable: >= 3.2.0, < 3.2.11 · source

go get github.com/argoproj/argo-cd/v3@v3.2.11 go list -m github.com/argoproj/argo-cd/v3

Fedora 46 · ddnet · FIXED · 20.2-1.fc46 · FEDORA-2026-6991b4ab14 · source

sudo dnf upgrade --advisory=FEDORA-2026-6991b4ab14

Fedora ELN · libplacebo · FIXED · 7.360.1-5.eln159 · FEDORA-2026-92226f221e · source

sudo dnf upgrade --advisory=FEDORA-2026-92226f221e

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: HAERIN-L/POC_CVE-2026-42880 (0 stars)
Write-up: github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42880?

argo cd: upgrade to 3.2.11, 3.3.9. Exact commands for each OS are on this page.

Is CVE-2026-42880 being exploited?

CVE-2026-42880 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42880 affect?

CVE-2026-42880 affects argo cd. Severity is critical (CVSS 9.6). 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

How urgent is CVE-2026-42880?

Priority 56/100. Critical severity; Public exploit reference; On your watchlist

Software pages

Kubernetes vulnerabilities · etcd vulnerabilities · ArgoCD vulnerabilities

Related CVEs

CVE-2026-45738 HIGH 7.3 UPGRADE Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes
CVE-2026-45737 MEDIUM 6.3 UPGRADE Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes

References

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