{"id":"CVE-2026-56763","revision":null,"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. 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When parsed results are merged into regular JavaScript objects using un…","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":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD 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":null}],"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://euvd.enisa.europa.eu/vulnerability/EUVD-2026-43173","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 11, 2026, 1:00:59 PM","dateUpdated":"Jul 14, 2026, 2:30:12 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-56763","identifiers":["CVE-2026-56763"]},"retained":false,"historicalAffected":[]},{"revision":"82174182989d4903a3f89d653e03f566","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-3wcj-gjvf-fvch","aliases":[],"title":"Duplicate Advisory: Hono vulnerable to Prototype Pollution possible through __proto__ key allowed in parseBody({ dot: true })","description":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00A0GHSA-v8w9-8mx6-g223.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.","state":2,"publishedAt":"2026-07-11T15:30:23+00:00","modifiedAt":"2026-10-02T22:45:04.3312858+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"CVSS_V4","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/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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-v8w9-8mx6-g223","https://nvd.nist.gov/vuln/detail/CVE-2026-56763","https://www.vulncheck.com/advisories/hono-prototype-pollution-via-proto-key-in-parsebody-with-dot-option"],"sourceUrl":"https://github.com/advisories/GHSA-3wcj-gjvf-fvch","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-3wcj-gjvf-fvch","identifiers":["GHSA-3wcj-gjvf-fvch"]},"retained":false,"historicalAffected":[]},{"revision":"37884565e21b4e8c94e5f404b9054543","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-v8w9-8mx6-g223","aliases":["CVE-2026-56763"],"title":"Hono vulnerable to Prototype Pollution possible through __proto__ key allowed in parseBody({ dot: true })","description":"## Summary\n\nWhen using `parseBody({ dot: true })` in HonoRequest, specially crafted form field names such as `__proto__.x` could create objects containing a `__proto__` property.\n\nIf the parsed result is later merged into regular JavaScript objects using unsafe merge patterns, this may lead to prototype pollution in the target object.\n\n## Details\n\nThe `parseBody({ dot: true })` feature supports dot notation to construct nested objects from form field names.\n\nIn previous versions, the `__proto__` path segment was not filtered. As a result, specially crafted keys such as `__proto__.x` could produce objects containing `__proto__` properties.\n\nWhile this behavior does not directly modify `Object.prototype` within Hono itself, it may become exploitable if the parsed result is later merged into regular JavaScript objects using unsafe merge patterns.\n\n## Impact\n\nApplications that merge parsed form data into regular objects using unsafe patterns (for example recursive deep merge utilities) may become vulnerable to prototype pollution.","state":0,"publishedAt":"2026-03-11T00:31:47+00:00","modifiedAt":"2026-10-02T22:45:04.5255877+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.12.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-v8w9-8mx6-g223","https://nvd.nist.gov/vuln/detail/CVE-2026-56763","https://github.com/honojs/hono/commit/ef902257e0beacbb83d2a9549b3b83e03514a6fe","https://github.com/honojs/hono","https://www.vulncheck.com/advisories/hono-prototype-pollution-via-proto-key-in-parsebody-with-dot-option"],"sourceUrl":"https://github.com/advisories/GHSA-v8w9-8mx6-g223","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-v8w9-8mx6-g223","identifiers":["GHSA-v8w9-8mx6-g223","CVE-2026-56763"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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