CVE-2026-42294: Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete

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HIGH 7.5REMOTEUPGRADE

CVE-2026-42294 is a high-severity flaw (CVSS 7.5) affecting argo workflows. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.,

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-05-09
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: argoproj

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-09 04:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

argoproj argo workflows UPGRADE

Affected: < 3.7.14 · >= 4.0.0 and < 4.0.5

Fixed in: 3.7.14, 4.0.5

Safe to downgrade to: a release before 4.0.0

1. Check installed version

apt-cache policy argo-workflows || rpm -q argo-workflows || argo-workflows --version

2. UPGRADE to 3.7.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade argo-workflows

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade argo-workflows

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison argo-workflows sudo apt install argo-workflows=<VERSION_BEFORE_4.0.0> sudo apt-mark hold argo-workflows

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list argo-workflows sudo dnf downgrade argo-workflows-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add argo-workflows

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42294?

argo workflows: upgrade to 3.7.14, 4.0.5. Exact commands for each OS are on this page.

Is CVE-2026-42294 being exploited?

CVE-2026-42294 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42294 affect?

CVE-2026-42294 affects argo workflows. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-42294?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Kubernetes vulnerabilities

Related CVEs

CVE-2026-40886 HIGH 7.7 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete
CVE-2026-54526 CRITICAL 9.9 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete
CVE-2026-42297 HIGH 8.3 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete
CVE-2026-42296 HIGH 8.1 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete
CVE-2026-42183 MEDIUM 6.5 UPGRADE Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernete

References

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