{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39410", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-07T00:23:30.595Z", "datePublished": "2026-04-08T14:44:40.797Z", "dateUpdated": "2026-04-08T15:17:14.892Z"}, "containers": {"cna": {"title": "Hono has a non-breaking space prefix bypass in cookie name handling in getCookie()", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4"}, {"name": "https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0"}, {"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": "2026-04-08T14:44:40.797Z"}, "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse(), allowing attacker-controlled cookies to override legitimate ones. This vulnerability is fixed in 4.12.12."}], "source": {"advisory": "GHSA-r5rp-j6wh-rvv4", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-08T15:17:07.686689Z", "id": "CVE-2026-39410", "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": "2026-04-08T15:17:14.892Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-39410", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-08T15:17:07.686689Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-08T15:17:10.331Z"}}], "cna": {"title": "Hono has a non-breaking space prefix bypass in cookie name handling in getCookie()", "source": {"advisory": "GHSA-r5rp-j6wh-rvv4", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "honojs", "product": "hono", "versions": [{"status": "affected", "version": "< 4.12.12"}]}], "references": [{"url": "https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4", "name": "https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0", "name": "https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/honojs/hono/releases/tag/v4.12.12", "name": "https://github.com/honojs/hono/releases/tag/v4.12.12", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse(), allowing attacker-controlled cookies to override legitimate ones. This vulnerability is fixed in 4.12.12."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20: Improper Input Validation"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-08T14:44:40.797Z"}}}, "cveMetadata": {"cveId": "CVE-2026-39410", "state": "PUBLISHED", "dateUpdated": "2026-04-08T15:17:14.892Z", "dateReserved": "2026-04-07T00:23:30.595Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-04-08T14:44:40.797Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse(), allowing attacker-controlled cookies to override legitimate ones. This vulnerability is fixed in 4.12.12."}], "id": "CVE-2026-39410", "lastModified": "2026-04-08T15:16:15.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-04-08T15:16:15.143", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/releases/tag/v4.12.12"}, {"source": "security-advisories@github.com", "url": "https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}