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Vulnerability record · CVE-2026-82257 · published 28 August 2026

CVE-2026-82257: Sveltekit prototype pollution vulnerability

Svelte · Sveltekit

SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.

5.3 CVSS 4.0 Medium EPSS 0.36% · top 73.0% CWE-1321 · Prototype pollution
5.3CVSS 4.0 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
31 Aug 2026Last modified by NVD

Description

SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x Vendor Advisory
https://www.vulncheck.com/advisories/sveltekit-before-2.69.1-prototype-pollution-via-file-input Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-82257), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.