What’s Vulnerable › Vulnerabilities

CVE-2026-82261: SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-10-08
• Weakness: CWE-400

Description

SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.

Affected products

• sveltejs kit: from 2.49.0 before 2.52.2 — fixed in 2.52.2

How to fix

Upgrade to a fixed version: sveltejs kit 2.52.2. Check the vendor advisory for mitigations.

References

• https://github.com/sveltejs/kit/security/advisories/GHSA-88qp-p4qg-rqm6
• https://www.vulncheck.com/advisories/sveltekit-before-2.52.2-cpu-exhaustion-via-remote-form-deserialization

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