# CVE-2026-128116: SvelteKit: Protocol-relative module import during server-side route resolution allows cross-origin script execution

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to versions 2.70.4 and 3.1.1, apps configured with router.resolution: 'server' could treat a pathname beginning with // as a protocol-relative module specifier during client-side navigation. A socially engineered link could therefore make server-side route resolution import and execute JavaScript from another origin in the user's browser. This issue is fixed in 2.70.4 and 3.1.1.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- sveltejs / kit: < 2.70.4 (affected); >= 3.0.0, < 3.1.1 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/sveltejs/kit/security/advisories/GHSA-rqp5-r3wg-vg35 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/sveltejs/kit/pull/17620 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/sveltejs/kit/commit/a8f7c1e09f13524d3b71d814bad9c15c9f33ef49 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.70.4 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@3.1.1 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-128116; retrieved 2026-11-13; source updated 2026-11-13

Revision: 812d5c956a45a3e21337fc2a0cdfef44b4791e31e3c7ebfcd87515dff67ce517

Canonical: https://y2.dev/cve/CVE-2026-128116

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