CPU Exhaustion Vulnerability in SvelteKit by SvelteJS
CVE-2026-82261

8.7HIGH

Key Information:

Vendor

Sveltejs

Status
Kit
Vendor
CVE Published:
28 August 2026

What is CVE-2026-82261?

SvelteKit versions from 2.49.0 to 2.52.1 exhibit a vulnerability related to CPU exhaustion due to experimental remote functions and form deserialization. By sending specially crafted malformed form data, an attacker can lead the server to become overwhelmed, resulting in unresponsiveness and a denial of service scenario. It is crucial for users of affected versions to update to 2.52.2 or later to mitigate this risk effectively.

Affected Version(s)

kit 2.49.0 < 2.52.1

kit 2.52.1

References

https://github.com/sveltejs/kit/security/advisories/GHSA-...
vendor-advisory
https://www.vulncheck.com/advisories/sveltekit-before-2.5...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

elliott-with-the-longest-name-on-github
.