{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-56763","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-06-22T21:55:17.942Z","datePublished":"2026-07-11T13:00:59.084Z","dateUpdated":"2026-07-14T14:30:12.573Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-07-11T13:00:59.084Z"},"datePublic":"2026-03-10T00:00:00.000Z","title":"Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","cweId":"CWE-1321","type":"CWE"}]}],"affected":[{"vendor":"Hono","product":"Hono","defaultStatus":"unaffected","packageURL":"pkg:npm/hono","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"4.12.7"},{"version":"4.12.7","status":"unaffected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*","versionEndExcluding":"4.12.7"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM"}}],"references":[{"url":"https://github.com/honojs/hono/security/advisories/GHSA-v8w9-8mx6-g223","name":"GitHub Security Advisory (GHSA-v8w9-8mx6-g223)","tags":["vendor-advisory"]},{"name":"VulnCheck Advisory: Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/hono-prototype-pollution-via-proto-key-in-parsebody-with-dot-option"}],"credits":[{"lang":"en","value":"0xkakash1","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-14T14:29:52.929231Z","id":"CVE-2026-56763","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-14T14:30:12.573Z"}}]}}