CVE-2026-42294

Summary

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 Software

Weaknesses

• CWE-770: CWE-770: Allocation of Resources Without Limits or Throttling

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/argoproj/argo-workflows/security/advisories/GHSA-jcc8-g2q4-9fxq

Argo Workflows: github.com/argoproj/argo-workflows: Argo Workflows: Denial of Service via large request body to Webhook Interceptor

Additional References

• https://access.redhat.com/security/cve/CVE-2026-42294
• https://bugzilla.redhat.com/show_bug.cgi?id=2468443
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42294.json

References

• https://github.com/argoproj/argo-workflows/security/advisories/GHSA-jcc8-g2q4-9fxq
• https://github.com/argoproj/argo-workflows/commit/7abb4de6c3599e2d5d960ba4d5de4cf1df109965
• https://github.com/argoproj/argo-workflows/releases/tag/v3.7.14
• https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5

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