CVE-2026-22803: high-severity vulnerability in sveltejs kit
SvelteKit has a memory amplification DoS in Remote Functions binary form deserializer
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.6%
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From 2.49.0 to 2.49.4, the experimental form remote function uses a binary data format containing a representation of submitted form data. A specially-crafted payload can cause the server to allocate a large amount of memory, causing DoS via memory exhaustion. This vulnerability is fixed in 2.49.5.
CVSS:4.0/AV:N/AC:L/AT:P/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-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-2026-82259HIGHSvelteKit 2.49.0 before 2.53.3 Denial of Service via formEPSS 0.5%CVE-2024-53262LOWUnescaped error message included on error page in SvelteKitEPSS 0.5%