CVE-2026-42294Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor
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.
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| argoproj | argo-workflows | < 3.7.14, >= 4.0.0, < 4.0.5 | |
| Red Hat | Red Hat OpenShift AI (RHOAI) | all versions |
References and patches
- https://github.com/argoproj/argo-workflows/security/advisories/GHSA-jcc8-g2q4-9fxq ExploitVendor Advisory
- https://github.com/argoproj/argo-workflows/commit/7abb4de6c3599e2d5d960ba4d5de4cf1df109965 Patch
- https://github.com/argoproj/argo-workflows/releases/tag/v3.7.14 Release Notes
- https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5 Release Notes
- 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
CPE matches (NVD) (2)
cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*< 3.7.14cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*≥ 4.0.0 < 4.0.5