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CVE-2026-42294

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

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
argoproj / argo-workflowsaffected < 3.7.14; affected >= 4.0.0, < 4.0.5

CWE

CWE-770

References

ADP enrichment

CISA-ADP

No English description supplied.

redhat-SADP

A flaw was found in Argo Workflows. The Webhook Interceptor, accessible via the /api/v1/events/ endpoint, loads the entire request body into memory before authenticating the request or verifying its signature. A remote attacker can exploit this by sending an extremely large request, causing the Argo Server to allocate excessive memory. This can lead to an Out-Of-Memory (OOM) crash, resulting in a denial of service (DoS) for the affected system.