CLEANSTART-2026-WF33342: Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures

Q: What does an attacker need to exploit this issue?

The supplied severity vector indicates network-based exploitation with low complexity, no privileges, and no user interaction required. Exploitation involves supplying deeply nested recursive structures for unmarshalling.

Q: Which deployments should be prioritized for triage?

Prioritize systems using cleanstart/kubernetes or cleanstart/argo-workflows where untrusted or externally supplied data can reach unmarshalling of recursive structures. The reported impact is availability loss through stack exhaustion.

Published Nov 11, 2026

Updated

CVE-2026-33818 affects multiple packages. Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures. See references for individual vulnerability details.

Affected Software

2 affected componentsFixes available

cleanstart/kubernetes<1.34.13-r2

1.34.13-r2

cleanstart/argo-workflows<4.1.6-r1

4.1.6-r1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade cleanstart/kubernetes to a version that resolves this vulnerability.
Fixed in 1.34.13-r2
Upgrade
Upgrade cleanstart/argo-workflows to a version that resolves this vulnerability.
Fixed in 4.1.6-r1

Event History

Nov 11, 2026

Advisory Published

via OSV·12:40 AM

Data Sourced

via OSV·12:40 AM

DescriptionSeverityAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

CVE-2026-33818

Frequently Asked Questions

What does an attacker need to exploit this issue?

The supplied severity vector indicates network-based exploitation with low complexity, no privileges, and no user interaction required. Exploitation involves supplying deeply nested recursive structures for unmarshalling.

Which deployments should be prioritized for triage?

Prioritize systems using cleanstart/kubernetes or cleanstart/argo-workflows where untrusted or externally supplied data can reach unmarshalling of recursive structures. The reported impact is availability loss through stack exhaustion.

CLEANSTART-2026-WF33342: Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures

Affected Software

Remediation

Event History

Child vulnerabilities

Frequently Asked Questions

What does an attacker need to exploit this issue?

Which deployments should be prioritized for triage?

Company

Resources

Contact

Frequently Asked Questions

What does an attacker need to exploit this issue?

Which deployments should be prioritized for triage?