CVE-2026-56763

MediumCVSS 4.8/10Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-1321

Affected software

No affected versions have been published.

Timeline

Published: Jul 11, 2026
Last modified: Oct 25, 2026
NVD status: Deferred

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