CVE-2026-42294

Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor

Published May 9, 2026 CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-jcc8-g2q4-9fxq Argo Vulnerable to Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor
History
Type Values Removed Values Added
First Time appeared Argoproj argo Workflows
CPEs cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*
Vendors & Products Argoproj argo Workflows
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Argoproj
Argoproj argo-workflows
Vendors & Products Argoproj
Argoproj argo-workflows
Type Values Removed Values Added
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.
Title Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor
Weaknesses CWE-770
References
Metrics cvssV4_0

{'score': 8.2, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 15, 2026, 12:57 AM
Reserved
Apr 26, 2026, 12:13 PM
Status
Modified
Published
May 9, 2026, 4:16 AM
Modified
Jul 24, 2026, 9:10 PM