{"id":"CVE-2026-56763","aliases":["GHSA-v8w9-8mx6-g223"],"url":"https://o3.security/vulnerability/CVE-2026-56763","summary":"Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option","details":"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.","published":"2026-07-11T13:00:59.084Z","modified":"2026-08-12T03:51:13.516638991Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"hono","fixedVersion":"4.12.7"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56763.json"},{"type":"ADVISORY","url":"https://github.com/honojs/hono/security/advisories/GHSA-v8w9-8mx6-g223"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56763"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/hono-prototype-pollution-via-proto-key-in-parsebody-with-dot-option"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:13.516638991Z"}}