CVE-2026-42570
7.5 · HIGHOverview
CVE-2026-42570 is a high-severity vulnerability affecting svelte devalue. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from svelte. Update devalue to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| svelte | devalue | >= 5.6.3, < 5.8.1 | Affected |
References
Frequently Asked Questions
What is CVE-2026-42570?
CVE-2026-42570 is a high-severity vulnerability affecting svelte devalue. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-42570?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-42570?
Check the references section for vendor advisories and patches from svelte. Update devalue to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-42570?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-42570 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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