GHSA-mcm9-63f2-9j32: Npm/devalue vulnerability

Published Oct 1, 2026
·
Updated

Under very constrained circumstances, data that was parsed and then passed to uneval could turn a small payload into a very large serialized string.

Affected Software

1 affected componentFixes available
npm/devalue<=5.9.2
5.9.3

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade npm/devalue to a version that resolves this vulnerability.

    Fixed in 5.9.3

Event History

Oct 1, 2026
Advisory Published
via GitHub·03:17 PM
Data Sourced
via GitHub·03:17 PM
DescriptionWeaknessAffected Software

Frequently Asked Questions

1

What input flow is affected?

The issue affects data that is first processed with `parse` and then passed to `uneval`, where a small payload can become a very large serialized string.

2

What conditions are required for exploitation?

The advisory describes exploitation as requiring very constrained circumstances. The provided information does not identify broader affected configurations or additional prerequisites.

3

What should be done to remediate the issue?

A release tagged v5.9.3 is referenced alongside the security advisory and fixing commit. Update to that release or later if applicable.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203