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Fencer Vulns
high 7.5

CVE-2026-42294 json

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

published 2026-05-04 6 mo ago modified 2026-09-08 2 mo ago also BIT-argo-workflows-2026-42294 , EUVD-2026-28892 , GHSA-jcc8-g2q4-9fxq , GO-2026-5462

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/argoproj/argo-workflows/v3 3.7.14
  • go github.com/argoproj/argo-workflows/v4 4.0.5
  • bitnami argo-workflows 3.7.14, 4.0.5
  • argo_workflows_project argo_workflows 3.7.14, 4.0.5
  • argoproj argo_workflows 3.7.14, 4.0.5
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-42294 updated cvss 7.5

Argo Workflows: github.com/argoproj/argo-workflows: Argo Workflows: Denial of Service via large request body to Webhook Interceptor

  • Red Hat OpenShift AI 3.3 rhoai/odh-data-science-pipelines-argo-argoexec-rhel9 1790132012, rhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel9 1790130173
    fixed: vendor fix RHSA-2026:73987
  • Red Hat OpenShift AI 3.3 rhoai/odh-cli-rhel9 1790070206, rhoai/rhai-cli-rhel9 1790070206, rhoai/odh-mlflow-rhel9 1789653606, rhoai/odh-trainer-rhel9 1790136369, rhoai/odh-maas-api-rhel9 1790131842, rhoai/odh-mlserver-rhel9 1789121365, +75 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/argoproj/argo-workflows/security/advisories/GHSA-jcc8-g2q4-9fxq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.2 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
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.2 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
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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
bitnami argo-workflows
<3.7.14
>=4.0.0, <4.0.5
3.7.14
4.0.5
go github.com/argoproj/argo-workflows
all versions
 no fix listed
go github.com/argoproj/argo-workflows/v2
all versions
 no fix listed

Affected products

  • argoproj argo-workflows
  • Red Hat Red Hat OpenShift AI (RHOAI)

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.