CVE-2026-128117

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to versions 2.70.4 and 3.1.1, the reroute hook could rewrite an invalid percent-encoded pathname into a valid route and reach a comparison that decoded the original malformed pathname outside the guarded decoding operation. The resulting unhandled URIError could crash an adapter-node server and deny service to other requests. This issue is fixed in 2.70.4 and 3.1.1.

• CWE-248

• https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd
• https://github.com/sveltejs/kit/commit/7993d5ebab017cb1be898a0b1c57371c5da06557
• https://github.com/sveltejs/kit/pull/17620
• https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.70.4
• https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@3.1.1
• https://github.com/sveltejs/kit/security/advisories/GHSA-mw6w-2fmv-pvw3

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.
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