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CVE-2026-22803

28
FAUCET Score

CVE-2026-22803 is a denial-of-service vulnerability affecting SvelteKit versions 2.49.0 through 2.49.4. An attacker can exploit an experimental form remote function by sending a specially crafted binary payload, leading to excessive memory allocation and server exhaustion. This vulnerability has a CVSS score of 7.5 (HIGH), indicating it can be exploited remotely with low attack complexity, resulting in high availability impact. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 11 mentions and one media article, suggesting awareness among researchers.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.49.0, < 2.49.5CPE matchmatch criteria
cpe:2.3:a:svelte:kit:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 4.0

8.2HIGH

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.53%
Probability of exploitation in next 30 days
EPSS Percentile
41.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0053 is in the 19th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @sveltejs/kitFixed in: 2.49.5

Vendor Advisories (1)

npmGHSA-j2f3-wq62-6q46high

@sveltejs/kit has memory amplification DoS vulnerability in Remote Functions binary form deserializer (application/x-sveltekit-formdata)

Jan 15, 2026

References

github.com / sveltejs/kit/commit/8ed8155215b9a74012fecffb942ad9a793b274e5
Patch
github.com / sveltejs/kit/releases/tag/@sveltejs%[email protected]
Release Notes
github.com / sveltejs/kit/security/advisories/GHSA-j2f3-wq62-6q46
Vendor Advisory