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    CVE-2026-82259

    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.

    Published:Aug 28, 2026
    Last Modified:Aug 31, 2026
    EPS:Aug 28, 2026
    EPSS Score:0.00371
    CVSS Score:7.5

    Affected Products

    Vendor
    Svelte
    Product
    Kit
    Vendor
    Svelte
    Product
    Sveltekit

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-586 Object Injection

    Related CVEs

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    CVE-2026-82257 (CVSS 5.3) — SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with fil…
    CVE-2026-82256 (CVSS 6.9) — SvelteKit before 2.69.1 fails to properly validate remote form function payload sizes, allowing attackers to c…
    CVE-2026-66062 (CVSS 5.3) — SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.7…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High