CVE-2026-42570

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.

PUBLISHED Reserved 2026-04-28 | Published 2026-06-09 | Updated 2026-06-09 | Assigner GitHub_M

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

References

github.com/...evalue/security/advisories/GHSA-77vg-94rm-hx3p

github.com/...ommit/206ca6712fbc380a4571c59de9ab04b91110792d

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

cve.org (CVE-2026-42570)

nvd.nist.gov (CVE-2026-42570)

Download JSON