CLEANSTART-2026-IU84577: Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit

Q: Who can exploit this issue?

The vector is network-accessible, and the supplied severity data indicates no privileges or user interaction are required. An attacker able to send HTTP requests to an affected argo-workflows deployment could trigger the condition.

Q: Is the default HTTP header size limit sufficient protection?

No. Although HTTP headers have a default 1 MB limit, the vulnerability is that there is no limit on the number of cookies that can be parsed.

Q: What is the expected security impact?

The provided metrics indicate low availability impact, with no confidentiality or integrity impact. This is consistent with resource consumption caused by processing an excessive number of cookies.

Published Nov 11, 2026

Updated

Security vulnerability affects the argo-workflows package. Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit.

Affected Software

1 affected componentFixes available

cleanstart/argo-workflows<4.1.6-r1

4.1.6-r1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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·12:38 AM

Data Sourced

via OSV·12:38 AM

DescriptionSeverityAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

CVE-2025-58186

Frequently Asked Questions

Who can exploit this issue?

The vector is network-accessible, and the supplied severity data indicates no privileges or user interaction are required. An attacker able to send HTTP requests to an affected argo-workflows deployment could trigger the condition.

Is the default HTTP header size limit sufficient protection?

No. Although HTTP headers have a default 1 MB limit, the vulnerability is that there is no limit on the number of cookies that can be parsed.

What is the expected security impact?

The provided metrics indicate low availability impact, with no confidentiality or integrity impact. This is consistent with resource consumption caused by processing an excessive number of cookies.

CLEANSTART-2026-IU84577: Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit

Affected Software

Remediation

Event History

Child vulnerabilities

Frequently Asked Questions

Who can exploit this issue?

Is the default HTTP header size limit sufficient protection?

What is the expected security impact?

Company

Resources

Contact

Frequently Asked Questions

Who can exploit this issue?

Is the default HTTP header size limit sufficient protection?

What is the expected security impact?