High severity · published Aug 28, 2026
CVE-2026-82261
SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KI
kit · sveltejs
2.49.0 before 2.52.1 · source: vendor
SV
Sveltekit · Svelte
2.49.0 before 2.52.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82261
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-82261
vendor-advisory
https://github.com/sveltejs/kit/security/advisories/GHSA-88qp-p4qg-rqm6
third-party-advisory
https://www.vulncheck.com/advisories/sveltekit-before-2.52.2-cpu-exhaustion-via-remote-form-deserialization
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