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.

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Source ID Title
Github GHSA Github GHSA GHSA-77vg-94rm-hx3p Svelte devalue: DoS via sparse array deserialization
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 12 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Thu, 11 Jun 2026 19:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:svelte:devalue:*:*:*:*:*:node.js:*:*

Tue, 09 Jun 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Svelte
Svelte devalue
Vendors & Products Svelte
Svelte devalue

Tue, 09 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 09 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Title Svelte devalue: DoS via sparse array deserialization
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-09T18:06:56.030Z

Reserved: 2026-04-28T17:26:12.084Z

Link: CVE-2026-42570

cve-icon Vulnrichment

Updated: 2026-06-09T18:06:42.643Z

cve-icon NVD

Status : Analyzed

Published: 2026-06-09T17:17:07.253

Modified: 2026-06-11T18:52:51.173

Link: CVE-2026-42570

cve-icon Redhat

Severity : Important

Publid Date: 2026-06-09T16:12:26Z

Links: CVE-2026-42570 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-09T20:00:17Z

Weaknesses