Is CVE-2026-40073 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-40073, but active exploitation has not been confirmed.

Can CVE-2026-40073 be exploited remotely?

Yes. CVE-2026-40073 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40073?

CVE-2026-40073 has a CVSS score of 7.5 (HIGH).

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HIGHPOC

CVE-2026-40073

CWE-770Published: 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, under certain circumstances, requests could bypass the BODY_SIZE_LIMIT on SvelteKit applications running with adapter-node. This bypass does not affect body size limits at other layers of the application stack, so limits enforced in the WAF, gateway, or at the platform level are unaffected. This vulnerability is fixed in 2.57.1.

NVD Source

Technical Analysis

CVE-2026-40073 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-2026-40073. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.