{"id":"CVE-2026-56763","revision":"b74baa087b374d4b91a9e92fe1f4a687","records":[{"revision":"b74baa087b374d4b91a9e92fe1f4a687","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-56763","aliases":[],"title":"Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option","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.","state":0,"publishedAt":"2026-07-11T13:00:59.084+00:00","modifiedAt":"2026-07-14T14:30:12.573+00:00","affected":[{"ecosystem":"Vendor product","name":"Hono","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Hono\",\n                    \"product\": \"Hono\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/hono\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"4.12.7\"\n                        },\n                        {\n                            \"version\": \"4.12.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56763","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-56763","identifiers":["CVE-2026-56763"]},"retained":false,"historicalAffected":[]}],"coverage":[]}