CVE-2026-42294
Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor
- State
- Published
- Severity
- 8.2 High
- Published
- May 9, 2026
- Updated
- Jul 15, 2026
- Reserved
- Apr 26, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
argo-workflowsargoproj |
|
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
- https://access.redhat.com/security/cve/CVE-2026-42294vdb-entry
- RHBZ#2468443issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42294.json
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.