CVE-2026-82259: high-severity vulnerability in sveltejs kit
SvelteKit 2.49.0 before 2.53.3 Denial of Service via form
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.5%
SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or individual file sizes, an attacker can submit relatively small inputs that expand into very large file arrays, leading to expensive processing and denial of service.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
sveltejs · kitRelated CVEs — sveltejs kit
In the same product, most dangerous first.
CVE-2024-23641HIGHSending a GET or HEAD request with a body crashes SvelteKitEPSS 0.8%CVE-2025-67647HIGHSvelteKit Denial of service and possible SSRF when using prerenderingEPSS 0.6%CVE-2026-22803HIGHSvelteKit has a memory amplification DoS in Remote Functions binary form deserializerEPSS 0.6%CVE-2023-29003HIGHSvelteKit has Insufficient Cross-Site Request Forgery ProtectionEPSS 0.6%CVE-2026-40073HIGHSvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter-nodeEPSS 0.5%CVE-2024-53262LOWUnescaped error message included on error page in SvelteKitEPSS 0.5%