CVE-2026-128117
SvelteKit: Unhandled URIError when `reroute` rewrites a malformed pathname crashes adapter-node
Description
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.
INFO
Published Date :
Nov. 13, 2026, 7:29 p.m.
Last Modified :
Nov. 13, 2026, 7:29 p.m.
Remotely Exploit :
Yes !
Source :
GitHub_M
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update SvelteKit to version 2.70.4 or 3.1.1.
- Ensure pathname decoding is handled securely.
- Test the application for stability.
- Deploy the updated application.
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