CVE-2026-42294
Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/argoproj/argo-workflows/v3 | < 3.7.14 | 3.7.14 |
| go | github.com/argoproj/argo-workflows/v4 | >= 4.0.0, < 4.0.5 | 4.0.5 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Argoproj | Argo Workflows | before 3.7.14 from 4.0.0 before 4.0.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jcc8-g2q4-9fxq
- 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/v4.0.5
- https://nvd.nist.gov/vuln/detail/CVE-2026-42294
- https://github.com/argoproj/argo-workflows/releases/tag/v3.7.14
- 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