argoproj argo-workflows up to 3.6.19/3.7.13/4.0.4 podGCFromPod array index

Summaryinfo

A vulnerability, which was classified as problematic, was found in argoproj argo-workflows up to 3.6.19/3.7.13/4.0.4. This vulnerability affects the function podGCFromPod. Such manipulation leads to array index. This vulnerability is documented as CVE-2026-40886. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in argoproj argo-workflows up to 3.6.19/3.7.13/4.0.4 and classified as problematic. Affected by this issue is the function podGCFromPod. The manipulation with an unknown input leads to a array index vulnerability. Using CWE to declare the problem leads to CWE-129. The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-40886 since 04/15/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

Upgrading to version 3.7.14 or 4.0.5 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25267). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• argoproj

Name

• argo-workflows

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3
• 3.6.4
• 3.6.5
• 3.6.6
• 3.6.7
• 3.6.8
• 3.6.9
• 3.6.10
• 3.6.11
• 3.6.12
• 3.6.13
• 3.6.14
• 3.6.15
• 3.6.16
• 3.6.17
• 3.6.18
• 3.6.19
• 3.7.0
• 3.7.1
• 3.7.2
• 3.7.3
• 3.7.4
• 3.7.5
• 3.7.6
• 3.7.7
• 3.7.8
• 3.7.9
• 3.7.10
• 3.7.11
• 3.7.12
• 3.7.13
• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4

Website

• Product: https://github.com/argoproj/argo-workflows/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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