CVE-2026-42296Public exploitNetwork attack vector

Pod security bypass via unchecked workflow spec overrides

Published May 9, 2026 · Updated May 9, 2026

Incorrect authorization in Argo Workflows before 3.7.14 and 4.0.0 through 4.0.4 allows remote authenticated users to alter pod security. JoinWorkflowSpec preserves user-supplied hostNetwork, serviceAccountName, securityContext, tolerations, and token-mount settings because the controller blocks only podSpecPatch. Exploitation requires create Workflow permission and Strict or Secure template referencing; Kubernetes admission controls can independently block some overrides.

CVSS severity8.1
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Argo Workflows before 3.7.14 and 4.0.0 through 4.0.4 allows remote authenticated users to alter pod security. JoinWorkflowSpec preserves user-supplied hostNetwork, serviceAccountName, securityContext, tolerations, and token-mount settings because the controller blocks only podSpecPatch. Exploitation requires create Workflow permission and Strict or Secure template referencing; Kubernetes admission controls can independently block some overrides.

The record

CVE
CVE-2026-42296
Published
May 9, 2026
Updated
May 9, 2026
Vendor
Argo Project
Product
Argo Workflows
Classifications
CWE-863, T1548
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2026CVE publishedPublication date reported by the CVE source.
  2. May 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.7.14
  2. Affected versionversion=>= 4.0.0, < 4.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Argo Project · Argo Workflowsversion=< 3.7.14; version=>= 4.0.0, < 4.0.5

Published CVSS scores

8.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
8.1Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1548Abuse Elevation Control Mechanism

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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