CVE-2026-82259
Last modified
CVE-2026-82259 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or individual file sizes, an attacker can submit relatively small inputs that expand into very large file arrays, leading to expensive processing and denial of service.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.
Description
SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or individual file sizes, an attacker can submit relatively small inputs that expand into very large file arrays, leading to expensive processing and denial of service.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS:4.0/AV:N/AC:L/AT:N/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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Svelte | Sveltekit | >= 2.49.0, < 2.53.3 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-82259?
How severe is CVE-2026-82259?
How do I fix CVE-2026-82259?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-82253gitoxide (Rust crates gix <= 0.72.0 and gix-validate <= 0.10…7.5
- CVE-2026-82254gitoxide before 0.69.0 contains unchecked array indexing in …7.5
- CVE-2026-82255gitoxide versions from 0.25.4 contain an HTTP credential lea…6.8
- CVE-2026-82256SvelteKit before 2.69.1 fails to properly validate remote fo…5.3
- CVE-2026-82257SvelteKit versions before 2.69.1 contain a prototype polluti…4.3
- CVE-2026-82258SvelteKit versions from 2.38.0 before 2.60.1 contain a race …4.8
- CVE-2026-8226A security flaw has been discovered in Open5GS up to 2.7.7. …7.5
- CVE-2026-82260SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 wit…7.5
- CVE-2026-82261SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 wit…7.5
- CVE-2026-82262Logto through 1.42.0 contains a server-side request forgery …6.8
- CVE-2026-82263Logto through 1.42.0 contains a server-side request forgery …6.8
- CVE-2026-82264Duplicacy through 3.2.5 contains a path traversal vulnerabil…6.8
Are you affected by CVE-2026-82259?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST