Read the docs
TI-2026-56726 Aliases CVE-2026-82261GHSA-xjpx-7387-jh7h

SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization

Priority MEDIUM 44CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00493 42nd percentileScored 2026-11-07
Fix Fixed kit (sveltejs): 2.52.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sveltejskit2.49.0 to before 2.52.12.52.1Patch availableCNA
  • kit Vendorsveltejs Affected 2.49.0 to before 2.52.1 Fixed in 2.52.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:svelte:sveltekit:*:*:*:*:*:node.js:*:*2.49.0 to before 2.52.2Vulnerablesveltejs
  • cpe:2.3:a:svelte:sveltekit:*:*:*:*:*:node.js:*:* Versions 2.49.0 to before 2.52.2 Vulnerable ·sveltejs

Remediation

  • Fix · CNA kit (sveltejs) Fixed in 2.52.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    sveltejs kit 2.52.1

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2026-56725 SvelteKit before 2.52.2 Memory Exhaustion via Remote Form DeserializationPriority MEDIUM 44
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-82261
  2. 2026-10-03 Alias added: GHSA-xjpx-7387-jh7h

References

Advisory 1

  • TI-2023-13469 SvelteKit framework has Insufficient CSRF protection for CORS requests CVSS 3.1HIGH 8.8
  • TI-2023-13464 SvelteKit has Insufficient Cross-Site Request Forgery Protection CVSS 3.1HIGH 8.8
  • TI-2026-56725 SvelteKit before 2.52.2 Memory Exhaustion via Remote Form Deserialization CVSS 4.0HIGH 8.7
  • TI-2026-56724 SvelteKit 2.49.0 before 2.53.3 Denial of Service via form CVSS 4.0HIGH 8.7
  • TI-2026-56721 SvelteKit before 2.69.1 Denial of Service via Remote Form CVSS 4.0MEDIUM 6.9
  • TI-2026-56723 SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch CVSS 4.0MEDIUM 5.9
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences