What is CVE-2026-40074?

CVE-2026-40074 is a high-severity vulnerability in Svelte Kit, classified under Improper Handling of Exceptional Conditions. CVSS score: 7.5/10. Published 2026-04-10.

How severe is CVE-2026-40074?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Svelte Kit

CVE-2026-40074

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, redirect, when called from inside the handle server hook with a location parameter containing characters that are invalid in…

EPSS: 0.004 (29.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Svelte Kit
Sveltejs Kit — versions < 2.57.1

Weakness classification (CWE)

CWE-755 — Improper Handling of Exceptional Conditions

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-40074?: CVE-2026-40074 is a high-severity vulnerability in Svelte Kit, classified under Improper Handling of Exceptional Conditions. CVSS score: 7.5/10. Published 2026-04-10.
How severe is CVE-2026-40074?: High severity. CVSS v3 base score is 7.5 out of 10.