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CVE-2026-40886— Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows controller

Quick assessment

Affected
argoproj argo-workflows
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Argo Workflows是Argo项目的一个用于 Kubernetes 的开源容器原生工作流引擎。 Argo Workflows 3.6.5版本至4.0.4版本存在输入验证错误漏洞，该漏洞源于pod informer的podGCFromPod函数中数组索引未检查，可能导致控制器进程崩溃。

CVSS 7.7 · High EPSS 0.59% · P47

Affected Version Matrix 3

VendorProduct Version RangeStatus
argoproj argo-workflows >= 4.0.0, < 4.0.5 affected
>= 3.7.0, < 3.7.14 affected
>= 3.6.5, <= 3.6.19 affected
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I. Basic Information for CVE-2026-40886

Vulnerability Information
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Vulnerability Title
Argo Workflows: Unchecked annotation parsing in pod informer crashes Argo Workflows controller
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Argo Workflows 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Argo Workflows是Argo项目的一个用于 Kubernetes 的开源容器原生工作流引擎。 Argo Workflows 3.6.5版本至4.0.4版本存在输入验证错误漏洞，该漏洞源于pod informer的podGCFromPod函数中数组索引未检查，可能导致控制器进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
argoproj argo-workflows >= 4.0.0, < 4.0.5 -

II. Public POCs for CVE-2026-40886

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III. Intelligence Information for CVE-2026-40886

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Vendor Advisories for CVE-2026-40886 (1)

IV. Related Vulnerabilities

Same product: argo-workflows
Same vendor: argoproj
Same weakness: CWE-129

V. Comments for CVE-2026-40886

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