Is CVE-2026-40074 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-40074, but active exploitation has not been confirmed.

Can CVE-2026-40074 be exploited remotely?

Yes. CVE-2026-40074 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40074?

CVE-2026-40074 has a CVSS score of 7.5 (HIGH).

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HIGHPOC

CVE-2026-40074

CWE-755Published: April 10, 2026· Updated: Apr 15, 2026

7.5

CVSS v3.1

Official Description

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 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. This vulnerability is fixed in 2.57.1.

NVD Source

Technical Analysis

CVE-2026-40074 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

A proof-of-concept (PoC) exploit exists for CVE-2026-40074. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.