{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-39409","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-04-07T00:23:30.594Z","datePublished":"2026-04-08T14:43:36.476Z","dateUpdated":"2026-04-08T16:13:05.175Z"},"containers":{"cna":{"title":"Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses","problemTypes":[{"descriptions":[{"cweId":"CWE-180","lang":"en","description":"CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"references":[{"name":"https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g","tags":["x_refsource_CONFIRM"],"url":"https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g"},{"name":"https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39"},{"name":"https://github.com/honojs/hono/releases/tag/v4.12.12","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/releases/tag/v4.12.12"}],"affected":[{"vendor":"honojs","product":"hono","versions":[{"version":"< 4.12.12","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-08T14:43:36.476Z"},"descriptions":[{"lang":"en","value":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12."}],"source":{"advisory":"GHSA-xpcf-pg52-r92g","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-08T16:08:52.269915Z","id":"CVE-2026-39409","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":"2026-04-08T16:13:05.175Z"}}]}}