Review reviewHigh

CVE-2026-42294

argoproj argo-workflows, Red Hat OpenShift AI (RHOAI), argo workflows

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 servic...

CVSS: 8.2
EPSS: 0.61%
CISA KEV: Not listed
Published: 2026.05.09

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.61%

Technical severityCVSS 8.2

Vulnerability overview

Affected product and versions

Product: argoproj argo-workflows, Red Hat OpenShift AI (RHOAI), argo workflows
Affected versions: >= < 3.7.14, >= >= 4.0.0, < 4.0.5, < 3.7.14, >= 4.0.0 < 4.0.5
Fixed versions: 3.7.14, 4.0.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that argoproj argo-workflows, Red Hat OpenShift AI (RHOAI), argo workflows and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: CWE-770