CVE-2026-40886: Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete

This month

HIGH 7.7UPGRADE

CVE-2026-40886 is a high-severity flaw (CVSS 7.7) 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 3.6.5 to 4.0.4, an unchecked array index in the pod informer's podGCFromPod() function causes a controller-wide panic when a workflow pod carries a malformed workflows.argoproj.io/pod-gc-strategy annotation. Because the panic occurs inside an informer goroutine (outside the controller's recover() scope), it crashes the entire cont

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
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-129, CWE-1285
Published	2026-04-23
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

2026-04-23 19:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

argoproj argo workflows UPGRADE

Affected: >= 3.6.5 and <= 3.6.19 · >= 3.7.0 and < 3.7.14 · >= 4.0.0 and < 4.0.5

Fixed in: 3.7.14, 4.0.5

Safe to downgrade to: a release before 3.6.5

1. Check installed version

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

2. UPGRADE to 3.7.14 (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 3.6.5 (Debian / Ubuntu)

apt-cache madison argo-workflows sudo apt install argo-workflows=<VERSION_BEFORE_3.6.5> 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_3.6.5> 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-2026-40886?

argo workflows: upgrade to 3.7.14, 4.0.5. Exact commands for each OS are on this page.

Is CVE-2026-40886 being exploited?

CVE-2026-40886 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-2026-40886 affect?

CVE-2026-40886 affects argo workflows. Severity is high (CVSS 7.7). Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. From 3.6.5 to 4.0.4, an unchecked array index in the pod informer's podGCFromPod() function causes a controller-wide panic when

How urgent is CVE-2026-40886?

Priority 40/100. High severity; Public exploit reference

Software pages

Kubernetes vulnerabilities

Related CVEs

CVE-2026-54526 CRITICAL 9.9 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete

References

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