High 8.2Published Jan 15, 2026

CVE-2026-22803SvelteKit has a memory amplification DoS in Remote Functions binary form deserializer

Updated under an hour ago (Oct 27, 2026, 4:20 AM ET)

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Every CVE for sveltejs kit

Exploited in the last 30 days

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: 8.2 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jan 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

sveltejs kit sveltejs:kit (from the name)	from 2.49.0, < 2.49.5	CNA record
svelte kit svelte:kit	from 2.49.0 before 2.49.5	NVD

References

References

https://github.com/sveltejs/kit/security/advisories/GHSA-j2f3-wq62-6q46	x-refsource-confirm, vendor-advisory
https://github.com/sveltejs/kit/commit/8ed8155215b9a74012fecffb942ad9a793b274e5	x-refsource-misc, patch
https://github.com/sveltejs/kit/releases/tag/@sveltejs%2Fadapter-node@5.5.1	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.