High severityOSV Advisory· Published Jan 15, 2026· Updated Jan 15, 2026
SvelteKit has a memory amplification DoS in Remote Functions binary form deserializer
CVE-2026-22803
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@sveltejs/kitnpm | >= 2.49.0, < 2.49.5 | 2.49.5 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-j2f3-wq62-6q46ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-22803ghsaADVISORY
- github.com/sveltejs/kit/commit/8ed8155215b9a74012fecffb942ad9a793b274e5ghsax_refsource_MISCWEB
- github.com/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.49.5ghsaWEB
- github.com/sveltejs/kit/releases/tag/@sveltejs%2Fadapter-node@5.5.1ghsax_refsource_MISCWEB
- github.com/sveltejs/kit/security/advisories/GHSA-j2f3-wq62-6q46ghsax_refsource_CONFIRMWEB
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