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Vulnerabilities CVE-2026-42570

CVE-2026-42570

High
Open
TLP:CLEAR

Svelte devalue: DoS via sparse array deserialization

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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.

Details

CVSS Score
7.5
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Jun 9, 2026
Last Modified
Aug 21, 2026
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