{"id":"EUVD-2026-8644","revision":null,"records":[{"revision":"09d10efcd0554644b3ce71d2940c8c98","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-27700","aliases":[],"title":"Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo","description":"Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header. Because AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled. This could allow IP-based access control mechanisms (such as the `ipRestriction` middleware) to be bypassed. Version 4.12.2 patches the issue.","state":0,"publishedAt":"2026-02-25T15:01:44.681+00:00","modifiedAt":"2026-02-27T17:01:28.403+00:00","affected":[{"ecosystem":"Vendor product","name":"hono","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"honojs\",\n                    \"product\": \"hono\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 4.12.0, < 4.12.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2,"severity":"HIGH"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3","https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7","https://github.com/honojs/hono/releases/tag/v4.12.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-27700","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-27700","identifiers":["CVE-2026-27700"]},"retained":false,"historicalAffected":[]},{"revision":"941d666631364acbb067e794fc67e35f","observedAt":"2026-11-15T11:08:33.07+00:00","statement":{"source":"euvd","id":"EUVD-2026-8644","aliases":["CVE-2026-27700","GHSA-xh87-mx6m-69f3"],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. 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Version 4.12.2 patches the issue.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2,"severity":null}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3","https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7","https://github.com/honojs/hono/releases/tag/v4.12.2"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-8644","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Feb 25, 2026, 3:01:44 PM","dateUpdated":"Feb 27, 2026, 5:01:28 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-2026-8644","identifiers":["EUVD-2026-8644","CVE-2026-27700","GHSA-xh87-mx6m-69f3"]},"retained":false,"historicalAffected":[]},{"revision":"b4548ea921cf4a848dfd808c9a1ee803","observedAt":"2026-10-25T06:17:33.365+00:00","statement":{"source":"nvd","id":"CVE-2026-27700","aliases":[],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` functi…","description":"Hono is a Web application framework that provides support for any JavaScript runtime. 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Version 4.12.2 patches the issue.","state":0,"publishedAt":"2026-02-25T16:23:26.44+00:00","modifiedAt":"2026-06-17T10:27:32.397+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7","https://github.com/honojs/hono/releases/tag/v4.12.2","https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-27700","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-290","CWE-345"],"productCriteria":["cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-02-25T16:23:26.440","lastModified":"2026-06-17T10:27:32.397"},"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-2026-27700","identifiers":["CVE-2026-27700"]},"retained":false,"historicalAffected":[]},{"revision":"3023c40121104e9380d4095ca5df58fc","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-xh87-mx6m-69f3","aliases":["CVE-2026-27700"],"title":"Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo","description":"## Summary\n\nWhen using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header.\n\nBecause AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled.\n\nThis could allow IP-based access control mechanisms (such as the `ipRestriction` middleware) to be bypassed.\n\n## Details\n\nIn ALB environments, AWS appends the actual client IP address to the end of any existing `X-Forwarded-For` header value. However, the previous implementation of `getConnInfo()` extracted the leftmost IP address:\n\n```ts\naddress = xff.split(',')[0].trim()\n```\n\nIf a client sent:\n\n```\nX-Forwarded-For: <spoofed-ip>\n```\n\nALB would forward:\n\n```\nX-Forwarded-For: <spoofed-ip>, <real-client-ip>\n```\n\nSince the implementation selected the first value, the spoofed IP address was trusted. This affected applications using:\n\n```ts\nipRestriction(getConnInfo, { allowList: [...] })\n```\n\nor any custom middleware relying on `getConnInfo(c).remote.address` for authorization decisions.\n\nThe issue only affects deployments using the AWS Lambda adapter behind an ALB. API Gateway (v1/v2) and Lambda Function URLs are not affected, as they use AWS-provided source IP values from `requestContext`.\n\n## Impact\n\nAn unauthenticated remote attacker could bypass IP-based access restrictions by supplying a crafted `X-Forwarded-For` header. This may allow access to resources that were intended to be restricted by IP address.\n\nOnly applications deployed behind an ALB and relying on `getConnInfo()` for IP-based authorization are affected.","state":0,"publishedAt":"2026-02-25T18:02:19+00:00","modifiedAt":"2026-09-10T03:50:36.1213745+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.12.0"},{"kind":"fixed","version":"4.12.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3","https://nvd.nist.gov/vuln/detail/CVE-2026-27700","https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7","https://github.com/honojs/hono","https://github.com/honojs/hono/releases/tag/v4.12.2"],"sourceUrl":"https://github.com/advisories/GHSA-xh87-mx6m-69f3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-xh87-mx6m-69f3","identifiers":["GHSA-xh87-mx6m-69f3","CVE-2026-27700"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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