8.2

CVE-2026-42294: argoproj argo_workflows

CVSS: 8.2v4.0HighModified
AliasesGHSA-jcc8-g2q4-9fxqBIT-argo-workflows-2026-42294GO-2026-5462
Published 09-05-2026Last modified 15-07-2026
Open JSON

Vulnerability summary

CVE-2026-42294 is a high (CVSS 8.2) vulnerability in argoproj argo_workflows. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 53.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
43/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.74%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:21483-1

Timeline

  1. 09-05-2026
    PublishedVulnerability first disclosed.
  2. 15-07-2026
    Last modifiedVulnerability information updated.

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 metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.74%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

+0.13 pp

From 0.61% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.74%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Argo Workflows

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard6 products
  • argo-workflow-controller-3.6All versions (No fix recorded)
  • argo-workflow-controller-fips-3.6All versions (No fix recorded)
  • argo-workflow-executor-3.6All versions (No fix recorded)
  • argo-workflow-executor-fips-3.6All versions (No fix recorded)
  • argo-workflows-3.6All versions (No fix recorded)
Github.com/argoproj/argo-workflows3 products
  • v2All versions (No fix recorded)
  • v3< 3.7.14
  • v4≥ 4.0.0, < 4.0.5
Argoproj2 products
Github.com/argoproj1 product
  • argo-workflowsAll versions (No fix recorded)

4 vendors · 12 products

References

10 links