CVE-2026-128121

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.

• CWE-116
• CWE-625

• https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd
• https://github.com/sveltejs/kit/commit/2ed61a6aa3ac230b89e3528654c587847d1525a0
• https://github.com/sveltejs/kit/pull/17620
• https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-static@3.0.11
• https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-static@4.0.1
• https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-vercel@6.3.5
• https://github.com/sveltejs/kit/releases/tag/@sveltejs/adapter-vercel@7.0.2
• https://github.com/sveltejs/kit/security/advisories/GHSA-jf9x-2fg2-hx4w

Published

Nov 13, 2026

Last Modified

Nov 13, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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