CVE-2026-128117
SvelteKit: Unhandled URIError when `reroute` rewrites a malformed pathname crashes adapter-node
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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 | CWE-248 |
| Vendor | sveltejs |
| Product | kit |
| Published | Nov 13, 2026 |
| Last Updated | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
sveltejs / kit
< 2.70.4 >= 3.0.0, < 3.1.1
References
github.com: https://github.com/sveltejs/kit/security/advisories/GHSA-mw6w-2fmv-pvw3 github.com: https://github.com/sveltejs/kit/pull/17620 github.com: https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd github.com: https://github.com/sveltejs/kit/commit/7993d5ebab017cb1be898a0b1c57371c5da06557 github.com: https://github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected] github.com: https://github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected]