{"id":"CVE-2026-59897","revision":"9f2938e5cfa2450b986fef7897fdf185","records":[{"revision":"9f2938e5cfa2450b986fef7897fdf185","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-59897","aliases":[],"title":"Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication","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":"2026-07-08T16:06:11.369+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":[]}],"coverage":[]}