CLEANSTART-2026-UX21645: Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not

Q: Which deployed components should be reviewed?

The advisory identifies cleanstart/kubernetes and cleanstart/argo-workflows as affected software. No affected or fixed version information is provided.

Q: What access does an attacker need?

The supplied vector indicates network-reachable exploitation with low attack complexity, requiring no privileges or user interaction.

Q: What is the expected security impact?

The supplied severity vector indicates high availability impact, with no stated confidentiality or integrity impact.

Published Nov 11, 2026

Updated

CVE-2026-56862 affects multiple packages. Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. 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-2026-56862

Frequently Asked Questions

Which deployed components should be reviewed?

The advisory identifies cleanstart/kubernetes and cleanstart/argo-workflows as affected software. No affected or fixed version information is provided.

What access does an attacker need?

The supplied vector indicates network-reachable exploitation with low attack complexity, requiring no privileges or user interaction.

What is the expected security impact?

The supplied severity vector indicates high availability impact, with no stated confidentiality or integrity impact.

CLEANSTART-2026-UX21645: Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not

Affected Software

Remediation

Event History

Child vulnerabilities

Frequently Asked Questions

Which deployed components should be reviewed?

What access does an attacker need?

What is the expected security impact?

Company

Resources

Contact

Frequently Asked Questions

Which deployed components should be reviewed?

What access does an attacker need?

What is the expected security impact?