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This issue is fixed in version 4.12.27.","state":0,"publishedAt":"2026-07-08T16:06:11.369+00:00","modifiedAt":"2026-07-09T13:51:31.335+00:00","affected":[{"ecosystem":"Vendor product","name":"hono","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"honojs\",\n                    \"product\": \"hono\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 4.3.3, < 4.12.27\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc","https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd","https://github.com/honojs/hono/releases/tag/v4.12.27"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-59897","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-59897","identifiers":["CVE-2026-59897"]},"retained":false,"historicalAffected":[]},{"revision":"1c7d7c764ee04edc900996b1028b679d","observedAt":"2026-11-07T13:26:06.959+00:00","statement":{"source":"euvd","id":"EUVD-2026-42325","aliases":["CVE-2026-59897","GHSA-xgm2-5f3f-mvvc"],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. 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This issue is fixed in version 4.12.27.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8,"severity":null}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc","https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd","https://github.com/honojs/hono/releases/tag/v4.12.27"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-42325","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 8, 2026, 4:06:11 PM","dateUpdated":"Jul 9, 2026, 1:51:31 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-42325","identifiers":["EUVD-2026-42325","CVE-2026-59897","GHSA-xgm2-5f3f-mvvc"]},"retained":false,"historicalAffected":[]},{"revision":"2c028a487b674782b9d9cb1bb0242b5f","observedAt":"2026-10-27T15:15:33.457+00:00","statement":{"source":"nvd","id":"CVE-2026-59897","aliases":[],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated request header value because it de-duplicates values using a substr…","description":"Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated request header value because it de-duplicates values using a substring comparison instead of an exact match, so middleware or application logic that depends on the complete X-Forwarded-For chain, rate limiting, audit logging, or proxy-chain validation can receive incomplete data. This issue is fixed in version 4.12.27.","state":0,"publishedAt":"2026-07-08T17:17:27.637+00:00","modifiedAt":"2026-10-25T17:10:00.197+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd","https://github.com/honojs/hono/releases/tag/v4.12.27","https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59897","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-348"],"productCriteria":["cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-07-08T17:17:27.637","lastModified":"2026-10-25T17:10:00.197"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-59897","identifiers":["CVE-2026-59897"]},"retained":false,"historicalAffected":[]},{"revision":"322f23d819674ceda8abbb91f86ded86","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-xgm2-5f3f-mvvc","aliases":["CVE-2026-59897"],"title":"Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication","description":"### Summary\n\nThe AWS API Gateway v1 adapter can drop a distinct repeated request header value. When a header appears multiple times, the adapter de-duplicates values using a substring comparison instead of an exact match, so a value that is a substring of another value of the same header is omitted (for example, `203.0.113.1` is dropped when another value is `203.0.113.10`).\n\n### Details\n\nA repeated request header carries an ordered list of values. Middleware or application logic that depends on the complete list — such as IP restriction that walks the `X-Forwarded-For` chain, rate limiting, audit logging, or proxy-chain validation — can therefore receive incomplete data that differs from what the client actually sent.\n\nThis issue arises on deployments using the AWS API Gateway v1 adapter (the same pattern also affects the VPC Lattice adapter), for requests that contain the same header more than once.\n\n### Impact\n\nAn attacker can craft repeated header values so that one value is omitted before the application sees the request. Where a security or routing decision relies on the full chain, this can alter that decision.\n\nThis affects applications deployed through Hono's AWS API Gateway v1 (or VPC Lattice) adapter that rely on the complete set of repeated request header values.","state":0,"publishedAt":"2026-07-21T18:18:13+00:00","modifiedAt":"2026-09-10T03:50:53.1679672+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.3.3"},{"kind":"fixed","version":"4.12.27"}]}],"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-xgm2-5f3f-mvvc","https://nvd.nist.gov/vuln/detail/CVE-2026-59897","https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd","https://github.com/honojs/hono","https://github.com/honojs/hono/releases/tag/v4.12.27"],"sourceUrl":"https://github.com/advisories/GHSA-xgm2-5f3f-mvvc","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-xgm2-5f3f-mvvc","identifiers":["GHSA-xgm2-5f3f-mvvc","CVE-2026-59897"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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