{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59897", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-07T16:40:07.984Z", "datePublished": "2026-07-08T16:06:11.369Z", "dateUpdated": "2026-07-08T16:06:11.369Z"}, "containers": {"cna": {"title": "Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication", "problemTypes": [{"descriptions": [{"cweId": "CWE-348", "lang": "en", "description": "CWE-348: Use of Less Trusted Source", "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-xgm2-5f3f-mvvc", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc"}, {"name": "https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd"}, {"name": "https://github.com/honojs/hono/releases/tag/v4.12.27", "tags": ["x_refsource_MISC"], "url": "https://github.com/honojs/hono/releases/tag/v4.12.27"}], "affected": [{"vendor": "honojs", "product": "hono", "versions": [{"version": ">= 4.3.3, < 4.12.27", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T16:06:11.369Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-xgm2-5f3f-mvvc", "discovery": "UNKNOWN"}}}}

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