SvelteKit: Prerendered paths are interpreted as regular expressions in Vercel route config generated by @sveltejs/adapter-vercel and @sveltejs/adapter-static

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-128121
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 20:18:56 UTC
Updated2026-11-13 22:17:23 UTC
DescriptionSvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to @sveltejs/adapter-vercel 6.3.5 and 7.0.2 and @sveltejs/adapter-static 3.0.11 and 4.0.1, an attacker-influenced link crawled during prerendering could be emitted into the generated Vercel routing configuration without escaping regular-expression metacharacters. The configuration could consequently interpret the path as regular-expression syntax, match unintended application paths, and expose content or behavior outside the intended path. This issue is fixed in @sveltejs/adapter-vercel 6.3.5 and 7.0.2 and @sveltejs/adapter-static 3.0.11 and 4.0.1.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-116 | CWE-625 | CWE-116 CWE-116: Improper Encoding or Escaping of Output | CWE-625 CWE-625: Permissive Regular Expression

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sveltejs Kit affected < 2.70.4 Not specified
CNA Sveltejs Kit affected >= 3.0.0-next.0, < 3.1.1 Not specified
CNA @sveltejs Adapter-vercel affected < 6.3.5 Not specified
CNA @sveltejs Adapter-vercel affected >= 7.0.0-next.0, < 7.0.2 Not specified
CNA @sveltejs Adapter-static affected < 3.0.11 Not specified
CNA @sveltejs Adapter-static affected >= 4.0.0-next.0, < 4.0.1 Not specified

References

ReferenceSourceLinkTags
github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected] [email protected] github.com
github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd [email protected] github.com
github.com/sveltejs/kit/security/advisories/GHSA-jf9x-2fg2-hx4w [email protected] github.com
github.com/sveltejs/kit/pull/17620 [email protected] github.com
github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected] [email protected] github.com
github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected] [email protected] github.com
github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected] [email protected] github.com
github.com/sveltejs/kit/commit/2ed61a6aa3ac230b89e3528654c587847d1525a0 [email protected] github.com
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