Security Advisory
CVE-2026-56763
4.8
MEDIUM
Vulnerability 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.
Published Date
July 11, 2026
Official Source
NIST NVD Advisory