Is CVE-2026-42570 actively exploited?

No active exploitation of CVE-2026-42570 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42570 be exploited remotely?

Yes. CVE-2026-42570 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42570?

CVE-2026-42570 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-42570

CWE-770Published: June 9, 2026· Updated: Jun 11, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-42570 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.