CVE-2026-56763
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.
- Score
- CVSS 4.0 6.3 Medium
- Status
- Deferred - disclosure@vulncheck.com
- Published
- 2026-07-11
- Last modified
- 2026-10-25
- Weaknesses
- CWE-1321
Affected products
References
- https://github.com/honojs/hono/security/advisories/GHSA-v8w9-8mx6-g223
- https://www.vulncheck.com/advisories/hono-prototype-pollution-via-proto-key-in-parsebody-with-dot-option
