CVE-2026-42570

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d	Patch
https://github.com/sveltejs/devalue/releases/tag/v5.8.1	Product Release Notes
https://github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p	Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:37272
https://access.redhat.com/errata/RHSA-2026:57590
https://access.redhat.com/security/cve/CVE-2026-42570
https://bugzilla.redhat.com/show_bug.cgi?id=2487050
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42570.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:svelte:devalue:*:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-06-09 17:17

Updated : 2026-08-24 13:18

NVD link : CVE-2026-42570

Mitre link : CVE-2026-42570

CVE.ORG link : CVE-2026-42570

JSON object : View

Products Affected

svelte

devalue

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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