CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-128117 SvelteKit: Unhandled URIError when `reroute` rewrites a malformed pathname crashes adapter-node
Medium (5.9) in sveltejs kit. Fixed in @sveltejs/kit 2.70.4, 3.1.1.
On this page
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.
Severity
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-13. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-248 Uncaught Exception
- OWASP Top 10
- A10:2025 Mishandling of Exceptional Conditions
- Published
- Modified
- Assigned by
- GitHub_M (CNA)
- NVD analysis
- Deferred: the NVD does not plan to analyze it
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| sveltejs kit | < 2.70.4 |
| sveltejs kit | >= 3.0.0, < 3.1.1 |
Fix and patched versions
@sveltejs/kit(npm): fixed in 3.1.1, 2.70.4
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-mw6w-2fmv-pvw3 | npm | @sveltejs/kit | >=3.0.0 <3.1.1 | 3.1.1 |
| GHSA-mw6w-2fmv-pvw3 | npm | @sveltejs/kit | <2.70.4 | 2.70.4 |
History
- The NVD deferred its analysis
Changes since this site first stored the record. The same for every record: /api/public/changes.
References
- 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