SvelteKit: Prerendered redirect paths can inject arbitrary rules into the `_redirects` file generated by `@sveltejs/adapter-cloudflare`

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-128122
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 20:18:57 UTC
Updated2026-11-13 22:14:15 UTC
DescriptionSvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From version 4.7.0 until versions 7.2.10 and 8.0.2, @sveltejs/adapter-cloudflare allowed an attacker-influenced link crawled during prerendering to place whitespace, control characters, wildcards, or placeholders into a prerendered redirect path. The adapter wrote those paths into the Cloudflare _redirects output without output-context validation, allowing a path to create unintended routing rules that could redirect or expose requests beyond the intended prerendered route. This issue is fixed in 7.2.10 and 8.0.2.

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-79 | CWE-93 | CWE-116 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation | CWE-93 CWE-93: Improper Neutralization of CRLF Sequences | CWE-116 CWE-116: Improper Encoding or Escaping of Output

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 >= 4.7.0, < 7.2.10 Not specified
CNA Sveltejs Kit affected >= 8.0.0-next.0, < 8.0.2 Not specified

References

ReferenceSourceLinkTags
github.com/sveltejs/kit/commit/0a2e58cbccdd46cac20aa5af4e2edf17e0da11dd [email protected] github.com
github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected] [email protected] github.com
github.com/sveltejs/kit/pull/17620 [email protected] github.com
github.com/sveltejs/kit/commit/679e0d84ea9951bb4f1e458a599066b5a451b08a [email protected] github.com
github.com/sveltejs/kit/security/advisories/GHSA-5wg4-q3ww-283h [email protected] github.com
github.com/sveltejs/kit/releases/tag/@sveltejs/[email protected] [email protected] github.com
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