{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27700","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-02-23T17:56:51.202Z","datePublished":"2026-02-25T15:01:44.681Z","dateUpdated":"2026-02-27T17:01:28.403Z"},"containers":{"cna":{"title":"Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo","problemTypes":[{"descriptions":[{"cweId":"CWE-345","lang":"en","description":"CWE-345: Insufficient Verification of Data Authenticity","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"CWE-290: Authentication Bypass by Spoofing","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3"},{"name":"https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7"},{"name":"https://github.com/honojs/hono/releases/tag/v4.12.2","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/releases/tag/v4.12.2"}],"affected":[{"vendor":"honojs","product":"hono","versions":[{"version":">= 4.12.0, < 4.12.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-02-25T15:01:44.681Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-xh87-mx6m-69f3","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-27T17:01:17.956003Z","id":"CVE-2026-27700","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-02-27T17:01:28.403Z"}}]}}