Description
Hono before 4.12.7 allows __proto__ key in parseBody with dot option enabled, permitting specially crafted form field names to create objects with __proto__ properties. When parsed results are merged into regular JavaScript objects using unsafe merge patterns, attackers can exploit this to achieve prototype pollution and modify object behavior.
CVSS 4.8EPSS 0.17700000000000002%Risk 0.49
View source- Published
- 2026-07-11 14:16:22
- Affected versions
- <4.12.7
- Type
- Library
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N