Vulnerability Description
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.70.2, the content negotiation header parser used by SvelteKit's request handling (for headers such as Accept) uses a regular expression vulnerable to quadratic backtracking, so a maliciously crafted header value can cause excessive CPU consumption and degrade or deny service. Version 2.70.2 fixes the issue.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/sveltejs/kit/commit/82712fc02c24b1dcf5b25d7a52129cd8455f04f5
- https://github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected]
- https://github.com/sveltejs/kit/security/advisories/GHSA-29g2-3rmr-qm68
FAQ
What is CVE-2026-66062?
CVE-2026-66062 is a vulnerability with a CVSS score of 5.3 (MEDIUM). SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.70.2, the content negotiation header parser used by SvelteKit's request handling (for heade...
How severe is CVE-2026-66062?
CVE-2026-66062 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66062?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.