CVE-2026-42183: Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete

Routine

MEDIUM 6.5UPGRADE

CVE-2026-42183 is a medium-severity flaw (CVSS 6.5) affecting argo workflows. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From version 4.0.0 to before version 4.0.5, a nil pointer dereference in server/auth/gatekeeper.go rbacAuthorization() causes a panic (denial of service) for SSO users whose claims match a namespace-level RBAC rule but not an SSO-namespace rule, when SSO_DELEGATE_RBAC_TO_NAMESPACE=true. This issue has been patched in version 4.0.5.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-05-09
Last modified	2026-07-24

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

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-09 04:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

argoproj argo workflows UPGRADE

Affected: >= 4.0.0 and < 4.0.5

Fixed in: 4.0.5

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 4.0.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade argo-workflows

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 4.0.0 (Debian / Ubuntu)

apt-cache madison argo-workflows sudo apt install argo-workflows=<VERSION_BEFORE_4.0.0> sudo apt-mark hold argo-workflows

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

dnf --showduplicates list argo-workflows sudo dnf downgrade argo-workflows-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add argo-workflows

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.

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-2026-42183?

argo workflows: upgrade to 4.0.5. Exact commands for each OS are on this page.

Is CVE-2026-42183 being exploited?

CVE-2026-42183 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-2026-42183 affect?

CVE-2026-42183 affects argo workflows. Severity is medium (CVSS 6.5). Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From version 4.0.0 to before version 4.0.5, a nil pointer dereference in server/auth/gatekeeper.go rbacAuthorization() causes a

How urgent is CVE-2026-42183?

Priority 36/100. Public exploit reference

Software pages

Kubernetes vulnerabilities

Related CVEs

CVE-2026-40886 HIGH 7.7 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete
CVE-2026-54526 CRITICAL 9.9 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete
CVE-2026-42294 HIGH 7.5 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete
CVE-2026-42297 HIGH 8.3 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete
CVE-2026-42296 HIGH 8.1 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete

References

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