CVE-2026-42570

HIGH EPSS 26.5%
Published Jun 9, 20263w ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Jun 9, 2026 3w ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
26.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-770

Affected Products 1

VendorProductVersionRange
sveltedevalue*≥5.6.3  –  <5.8.1

References 3

  • github.com https://github.com/sveltejs/devalue/commit/206ca6712fbc380a4571c59de9ab04b91110792d
    Patch
  • github.com https://github.com/sveltejs/devalue/releases/tag/v5.8.1
    ProductRelease Notes
  • github.com https://github.com/sveltejs/devalue/security/advisories/GHSA-77vg-94rm-hx3p
    Vendor Advisory

Remediation

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