{"id":"EUVD-2026-42325","enisaUuid":"3ea92738-c125-3f7d-8c2b-cf3ba0ca8c02","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.","datePublished":"Jul 8, 2026, 4:06:11 PM","dateUpdated":"Jul 9, 2026, 1:51:31 PM","baseScore":4.8,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","references":"https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc\nhttps://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd\nhttps://github.com/honojs/hono/releases/tag/v4.12.27\n","aliases":"CVE-2026-59897\nGHSA-xgm2-5f3f-mvvc\n","assigner":"GitHub_M","epss":0.18,"enisaIdProduct":[{"id":"070aff87-0729-3a1f-a216-51e5a4741185","product":{"name":"hono","vendor":{"name":"honojs"}},"product_version":"4.3.3, \u003c 4.12.27"}],"enisaIdVendor":[{"id":"d0506417-2ae9-315d-8d79-8dbe74be4012","vendor":{"name":"honojs"}}],"enisaIdVulnerability":[{"id":"23339880-fdb0-32e8-8e93-b6d40caa5602","vulnerability":{"id":"CVE-2026-59897","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.","datePublished":"Jul 8, 2026, 4:06:11 PM","dateUpdated":"Jul 9, 2026, 1:51:31 PM","status":"PUBLISHED","baseScore":4.8,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","references":"https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc\nhttps://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd\nhttps://github.com/honojs/hono/releases/tag/v4.12.27\n","enisa_id":"EUVD-2026-42325\n","assigner":"GitHub_M","epss":0.18,"dataProcessed":"Nov 1, 2026, 7:18:17 AM","vulnerabilityProduct":[{"id":"70b49985-d635-3188-9d6b-96aa56d3e330","product":{"name":"hono","vendor":{"name":"honojs"}},"product_version":"4.3.3, \u003c 4.12.27"}],"vulnerabilityVendor":[{"id":"947cd593-ade3-35df-ab9a-975d6c8e92e6","vendor":{"name":"honojs"}}]}},{"id":"38ba4b58-68ed-3771-a1d6-73714c1223b0","vulnerability":{"id":"GHSA-xgm2-5f3f-mvvc","description":"Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication","datePublished":"Jul 21, 2026, 6:18:13 PM","dateUpdated":"Jul 21, 2026, 6:18:13 PM","baseScore":0.0,"references":"https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-59897\nhttps://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd\nhttps://github.com/honojs/hono\nhttps://github.com/honojs/hono/releases/tag/v4.12.27\n","enisa_id":"EUVD-2026-42325\n","aliases":"GHSA-xgm2-5f3f-mvvc\nCVE-2026-59897\n","epss":0.0,"dataProcessed":"Nov 1, 2026, 2:03:08 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}