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CVE-2026-40886

Argoproj Argo Workflows vulnerability

7.7 HIGHPublic exploitEPSS 0.59%
  1. Published23 Apr 2026

Description

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 controller process. The poisoned pod persists across restarts, causing a crash loop that halts all workflow processing until the pod is manually deleted. This vulnerability is fixed in 4.0.5 and 3.7.14.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Affected products

Argoproj Argo Workflows≥ 3.6.5 ≤ 3.6.19 · ≥ 3.7.0 < 3.7.14 · ≥ 4.0.0 < 4.0.5

Remediation

Fixed in
Argoproj Argo Workflows≥ 3.7.14

References

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Frequently asked

Is CVE-2026-40886 being actively exploited?

CVE-2026-40886 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.59%.

How severe is CVE-2026-40886?

CVE-2026-40886 has a CVSS 3.1 base score of 7.7, rated high. EPSS estimates a 0.59% probability of exploitation.

Which products are affected by CVE-2026-40886?

Affected products include Argoproj Argo Workflows.

How do I fix CVE-2026-40886?

Upgrade affected software to a fixed version, for example Argoproj Argo Workflows 3.7.14 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40886 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.