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CVE-2026-42294

Argoproj Argo Workflows denial of service

7.5 HIGHPublic exploitEPSS 0.74%
  1. Published9 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Argoproj Argo Workflows≥ 4.0.0 < 4.0.5 · < 3.7.14

Remediation

Fixed in
Argoproj Argo Workflows≥ 4.0.5

References

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Frequently asked

Is CVE-2026-42294 being actively exploited?

CVE-2026-42294 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.74%.

How severe is CVE-2026-42294?

CVE-2026-42294 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.74% probability of exploitation.

Which products are affected by CVE-2026-42294?

Affected products include Argoproj Argo Workflows.

How do I fix CVE-2026-42294?

Upgrade affected software to a fixed version, for example Argoproj Argo Workflows 4.0.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.