{"id":"GHSA-3wcj-gjvf-fvch","summary":"Duplicate Advisory: Hono vulnerable to Prototype Pollution possible through __proto__ key allowed in parseBody({ dot: true })","details":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-v8w9-8mx6-g223. This link is maintained to preserve external references.\n\n## Original Description\n\nHono 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pollution and modify object behavior.","modified":"2026-10-02T22:45:04.331285767Z","published":"2026-07-11T15:30:23Z","withdrawn":"2026-10-02T22:35:59Z","database_specific":{"github_reviewed_at":"2026-10-02T22:35:59Z","nvd_published_at":"2026-07-11T14:16:22Z","cwe_ids":["CWE-1321"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","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":"WEB","url":"https://www.vulncheck.com/advisories/hono-prototype-pollution-via-proto-key-in-parsebody-with-dot-option"}],"affected":[{"package":{"name":"hono","ecosystem":"npm","purl":"pkg:npm/hono"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c 4.12.7","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-3wcj-gjvf-fvch/GHSA-3wcj-gjvf-fvch.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"CVSS_V4","score":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}