CVE-2026-42294

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42294.json

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

https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5

https://github.com/argoproj/argo-workflows/releases/tag/v3.7.14

https://github.com/argoproj/argo-workflows/commit/7abb4de6c3599e2d5d960ba4d5de4cf1df109965

https://bugzilla.redhat.com/show_bug.cgi?id=2468443

https://access.redhat.com/security/cve/CVE-2026-42294

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS