SvelteKit: Prototype pollution in file input deletion path in remote-function forms
If you use remote form functions, have an input field of type `file`, and accept arbitrary user-controlled path names for the field, then you are vulnerable to a prototype pollution attack where the attacker can remove e.g. methods on the prototype.
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-82257US | medium4.3 | — | ||
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. Attac… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/sveltejs/kitPACKAGE
- https://github.com/sveltejs/kit/commit/df32f6fe86cdd0b68b650e3e4631e5896453dcd3WEB
- https://github.com/sveltejs/kit/pull/16218WEB
- https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@2.69.1WEB
- https://github.com/sveltejs/kit/releases/tag/@sveltejs/kit@3.0.0-next.7WEB
- https://github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7xWEB
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