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  5. CVE-2026-40074

CVE-2026-40074: @sveltejs/kit: Unvalidated redirect in handle hook causes Denial-of-Service

April 10, 2026

redirect, when called from inside the handle server hook with a location parameter containing characters that are invalid in a HTTP header, will cause an unhandled TypeError. This could result in DoS on some platforms, especially if the location passed to redirect contains unsanitized user input.

References

  • github.com/advisories/GHSA-3f6h-2hrp-w5wx
  • github.com/sveltejs/kit
  • github.com/sveltejs/kit/commit/10d7b44425c3d9da642eecce373d0c6ef83b4fcd
  • github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.57.1
  • github.com/sveltejs/kit/security/advisories/GHSA-3f6h-2hrp-w5wx
  • nvd.nist.gov/vuln/detail/CVE-2026-40074

Code Behaviors & Features

Detect and mitigate CVE-2026-40074 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions before 2.57.1

Fixed versions

  • 2.57.1

Solution

Upgrade to version 2.57.1 or above.

Impact 5.8 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-755: Improper Handling of Exceptional Conditions

Source file

npm/@sveltejs/kit/CVE-2026-40074.yml

Spotted a mistake? Edit the file on GitLab.

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