CVE-2026-56763
Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option
CVSS Score
4.8
EPSS Score
0.2%
EPSS Percentile
7th
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.
| CWE | CWE-1321 |
| Vendor | hono |
| Product | hono |
| Published | Jul 11, 2026 |
| Last Updated | Jul 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
Hono / Hono
0 < 4.12.7
References
Credits
🔍 0xkakash1