CVE-2026-42294

HIGH EPSS 41.6%
Published May 9, 20261mo ago · Modified Jun 17, 20261w ago
8.2 CVSS 4.0
High
Find Similar
Published May 9, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
8.2
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
41.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-770

Affected Products 2

VendorProductVersionRange
argoprojargo_workflows* <3.7.14
argoprojargo_workflows*≥4.0.0  –  <4.0.5

References 4

  • github.com https://github.com/argoproj/argo-workflows/commit/7abb4de6c3599e2d5d960ba4d5de4cf1df109965
    Patch
  • github.com https://github.com/argoproj/argo-workflows/releases/tag/v3.7.14
    Release Notes
  • github.com https://github.com/argoproj/argo-workflows/releases/tag/v4.0.5
    Release Notes
  • github.com https://github.com/argoproj/argo-workflows/security/advisories/GHSA-jcc8-g2q4-9fxq
    ExploitVendor Advisory

Remediation

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