Skip to content
OpenAdvisories
Medium · 5.9 CVE-2026-128121 EUVD-2026-125766GHSA-jf9x-2fg2-hx4w

SvelteKit: Prerendered paths are interpreted as regular expressions in Vercel route config generated by @sveltejs/adapter-vercel and @sveltejs/adapter-static

Published Nov 13, 2026 · Updated Nov 13, 2026 · Assigned by GitHub_M

Description

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to @sveltejs/adapter-vercel 6.3.5 and 7.0.2 and @sveltejs/adapter-static 3.0.11 and 4.0.1, an attacker-influenced link crawled during prerendering could be emitted into the generated Vercel routing configuration without escaping regular-expression metacharacters. The configuration could consequently interpret the path as regular-expression syntax, match unintended application paths, and expose content or behavior outside the intended path. This issue is fixed in @sveltejs/adapter-vercel 6.3.5 and 7.0.2 and @sveltejs/adapter-static 3.0.11 and 4.0.1.

Affected products

VendorProductAffectedFixed
sveltejs kit < 2.70.4, >= 3.0.0-next.0, < 3.1.1 —
@sveltejs adapter-vercel < 6.3.5, >= 7.0.0-next.0, < 7.0.2 —
@sveltejs adapter-static < 3.0.11, >= 4.0.0-next.0, < 4.0.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @sveltejs/adapter-static >= 4.0.0-next.0, < 4.0.1 4.0.1 GHSA-jf9x-2fg2-hx4w
npm @sveltejs/adapter-static < 3.0.11 3.0.11 GHSA-jf9x-2fg2-hx4w
npm @sveltejs/adapter-vercel < 6.3.5 6.3.5 GHSA-jf9x-2fg2-hx4w
npm @sveltejs/adapter-vercel >= 7.0.0-next.0, < 7.0.2 7.0.2 GHSA-jf9x-2fg2-hx4w

References