Medium severity4.8NVD Advisory· Published Jul 11, 2026· Updated Jul 14, 2026

CVE-2026-56763

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.

Affected products

Honojs/Honollm-fuzzy
Range: <4.12.7

Patches

Vulnerability mechanics

References

github.com/honojs/hono/security/advisories/GHSA-v8w9-8mx6-g223nvd
www.vulncheck.com/advisories/hono-prototype-pollution-via-proto-key-in-parsebody-with-dot-optionnvd

News mentions

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