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CVE-2026-42294

32
FAUCET Score

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.

First published: May 9, 2026Last modified: May 11, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 3.7.14CPE matchmatch criteria
cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*
>= 4.0.0, < 4.0.5CPE matchmatch criteria
cpe:2.3:a:argoproj:argo_workflows:*:*:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 4.0

8.2HIGH

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
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.61%
Probability of exploitation in next 30 days
EPSS Percentile
45.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0061 is in the 22nd percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/argoproj/argo-workflows/v3Fixed in: 3.7.14
gopatch availablevia ghsa
Product: github.com/argoproj/argo-workflows/v4Fixed in: 4.0.5

Vendor Advisories (1)

goGHSA-jcc8-g2q4-9fxqhigh

Argo Vulnerable to Unauthenticated Memory Exhaustion (DoS) in Webhook Interceptor

May 4, 2026

References

access.redhat.com / security/cve/CVE-2026-42294
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-42294.json
github.com / argoproj/argo-workflows/commit/7abb4de6c3599e2d5d960ba4d5de4cf1df109965
Patch
github.com / argoproj/argo-workflows/releases/tag/v3.7.14
Release Notes
github.com / argoproj/argo-workflows/releases/tag/v4.0.5
Release Notes
github.com / argoproj/argo-workflows/security/advisories/GHSA-jcc8-g2q4-9fxq
ExploitVendor Advisory