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CVE-2026-42294— Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor

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 3.7.14之前版本和4.0.5之前版本存在安全漏洞，该漏洞源于Webhook Interceptor在验证请求或签名前将整个请求体加载到内存中，可能导致攻击者发送超大请求体导致内存耗尽和拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.74% · P53

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
argoproj argo-workflows < 3.7.14 affected
>= 4.0.0, < 4.0.5 affected
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I. Basic Information for CVE-2026-42294

Vulnerability Information
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Vulnerability Title
Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor
Source: CVE Program / CVE List V5
Vulnerability Description
Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Prior to versions 3.7.14 and 4.0.5, the Webhook Interceptor loads the entire request body into memory before authenticating the request or verifying its signature. This occurs on the /api/v1/events/ endpoint, which is publicly accessible (albeit intended for webhooks). An attacker can send a request with an extremely large body (e.g., multiple gigabytes), causing the Argo Server to allocate excessive memory, potentially leading to an Out-Of-Memory (OOM) crash and denial of service. This issue has been patched in versions 3.7.14 and 4.0.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Argo Workflows 安全漏洞
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 3.7.14之前版本和4.0.5之前版本存在安全漏洞，该漏洞源于Webhook Interceptor在验证请求或签名前将整个请求体加载到内存中，可能导致攻击者发送超大请求体导致内存耗尽和拒绝服务。
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 < 3.7.14 -

II. Public POCs for CVE-2026-42294

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III. Intelligence Information for CVE-2026-42294

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Patches & Fixes for CVE-2026-42294 (1)

Vendor Advisories for CVE-2026-42294 (1)

Same Patch Batch · argoproj · 2026-05-09 · 5 CVEs total

CVE-2026-42296 8.1 HIGH Argo Workflows has incomplete fix for CVE-2026-31892: hostNetwork, securityContext, servic
CVE-2026-42297 Argo Workflows Is Missing Authorization in Sync ConfigMap Provider
CVE-2026-42183 Argo Workflows: SSO RBAC Delegation Nil Pointer Dereference DoS (gatekeeper.go)
CVE-2026-42295 Argo Workflows: Exposure of artifact repository credentials

IV. Related Vulnerabilities

Same product: argo-workflows
Same vendor: argoproj
Same weakness: CWE-770

V. Comments for CVE-2026-42294

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