sveltejs devalue up to 5.6.1 devalue.parse amplification

Summaryinfo

A vulnerability marked as problematic has been reported in sveltejs devalue up to 5.6.1. This affects the function devalue.parse. The manipulation leads to amplification. This vulnerability is uniquely identified as CVE-2026-22774. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in sveltejs devalue up to 5.6.1. It has been rated as problematic. This issue affects the function devalue.parse. The manipulation with an unknown input leads to a amplification vulnerability. Using CWE to declare the problem leads to CWE-405. The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric." Impacted is availability. The summary by CVE is:

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.3.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the typed array hydration expecting an ArrayBuffer as input, but not checking the assumption before creating the typed array. This vulnerability is fixed in 5.6.2.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-22774 since 01/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 5.6.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch e46afa64dd2b25aa35fb905ba5d20cea63aabbf7 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• sveltejs

Name

• devalue

Version

• 5.6.0
• 5.6.1

License

• open-source

Website

• Product: https://github.com/sveltejs/devalue/

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