VULNERABILITY INTELLIGENCE
CVE-2026-56763
CVSS score4.8 MEDIUM
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-07-11
Last modified2026-10-25
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
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.
Weakness classification
- disclosure@vulncheck.com: CWE-1321