CVE-2026-42570

Published: Jun 9, 2026Modified: Jun 11, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: security-advisories@github.com (Secondary)

Description

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.

Affected (1)

Products: Svelte: Devalue

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Svelte Devalue	From 5.6.3 to 5.8.1

Related CWEs

Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

References (3)

https://github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d

Source: security-advisories@github.com

Patch

https://github.com/sveltejs/devalue/releases/tag/v5.8.1

Source: security-advisories@github.com

ProductRelease Notes

https://github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p

Source: security-advisories@github.com

Vendor Advisory

Timeline

No history available yet.