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CVE-2026-42294

Argo Workflows: Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor

Published: May 9, 2026Updated: May 14, 2026 Sources: CVE List NVDCWE-770
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 58.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

argo-workflowsargoproj
Mixed
Cloud & SaaS / container-orchestration
argo workflowsargoproj
Mixed
Cloud & SaaS / container-orchestration
argoprojoss-projectCloud & SaaSaka argo cd, argo-cd, argo workflows, argo workflow

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/argoproj/argo-workflows/security/advisories/GHSA-jcc8-g2q4-9fxq
github.com
https://github.com/argoproj/argo-workflows/commit/7abb4de6c3599e2d5d960ba4d5de4cf1df109965
github.com
https://github.com/argoproj/argo-workflows/releases/tag/v3.7.14
github.com
and 1 more references View all →

Timeline

Published
May 9, 2026
Last Updated
May 14, 2026

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