{"id":"CVE-2026-54288","revision":null,"records":[{"revision":"dd9dd89bf0404b639f78b411a5291776","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-54288","aliases":[],"title":"Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, the Body Limit Middleware trusts the request's Content-Length header to decide whether a body is within the limit. On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared Content-Length, which need not match the actual payload. A client can declare a tiny Content-Length while sending a much larger body, slipping past the limit. This vulnerability is fixed in 4.12.25.","state":0,"publishedAt":"2026-06-22T17:18:24.532+00:00","modifiedAt":"2026-06-23T16:11:23.131+00:00","affected":[{"ecosystem":"Vendor product","name":"hono","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"honojs\",\n                    \"product\": \"hono\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.12.25\",\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:L/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-rv63-4mwf-qqc2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54288","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-54288","identifiers":["CVE-2026-54288"]},"retained":false,"historicalAffected":[]},{"revision":"44e2e5d8b0364f7284bd6c8ac2754cd7","observedAt":"2026-11-07T12:29:08.761+00:00","statement":{"source":"euvd","id":"EUVD-2026-38331","aliases":["CVE-2026-54288","GHSA-rv63-4mwf-qqc2"],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. 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This vulnerability is fixed in 4.12.25.","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:L/I:L/A:N","score":6.5,"severity":null}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-rv63-4mwf-qqc2"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38331","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 22, 2026, 5:18:24 PM","dateUpdated":"Jun 23, 2026, 4:11:23 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. 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On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared Content-Length, which need not match the actual payload. A client can declare a tiny Content-Length while sending a much larger body, slipping past the limit. This vulnerability is fixed in 4.12.25.","state":0,"publishedAt":"2026-06-22T19:17:19.553+00:00","modifiedAt":"2026-10-25T23:10:00.167+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:L/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-rv63-4mwf-qqc2"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54288","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-345"],"productCriteria":[],"sourceDates":{"published":"2026-06-22T19:17:19.553","lastModified":"2026-10-25T23:10:00.167"},"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-2026-54288","identifiers":["CVE-2026-54288"]},"retained":false,"historicalAffected":[]},{"revision":"a9fb35d5360d4c0ab893c8c0c6021929","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-rv63-4mwf-qqc2","aliases":["CVE-2026-54288"],"title":"hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`","description":"### Summary\n\nThe Body Limit Middleware trusts the request's `Content-Length` header to decide whether a body is within the limit. On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared `Content-Length`, which need not match the actual payload. A client can declare a tiny `Content-Length` while sending a much larger body, slipping past the limit.\n\n### Details\n\nWhen `Content-Length` is present and `Transfer-Encoding` is absent, the middleware compares the declared value against the limit and passes the request through if it is small enough. On standards-based runtimes the transport enforces that `Content-Length` matches the body, so this is safe. The Lambda adapters instead reconstruct the request from a buffered payload and copy the client's `Content-Length` verbatim, so the declared length and the real body size are decoupled.\n\nThis issue affects applications deployed on AWS Lambda that rely on the Body Limit Middleware to cap request body size.\n\n### Impact\n\nThe declared body-size limit can be bypassed: a handler reads a payload larger than the configured maximum. Processing the oversized payload (large JSON, multipart, etc.) consumes additional CPU and memory per request. The payload remains bounded by the platform's request size limits, and Lambda isolates invocations, so the impact is increased per-request resource usage rather than full denial of service. This affects applications deployed on AWS Lambda that use the Body Limit Middleware.","state":0,"publishedAt":"2026-06-16T14:32:49+00:00","modifiedAt":"2026-09-10T03:50:50.5046419+00:00","affected":[{"ecosystem":"npm","name":"hono","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.12.25"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-rv63-4mwf-qqc2","https://nvd.nist.gov/vuln/detail/CVE-2026-54288","https://github.com/honojs/hono"],"sourceUrl":"https://github.com/advisories/GHSA-rv63-4mwf-qqc2","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-rv63-4mwf-qqc2","identifiers":["GHSA-rv63-4mwf-qqc2","CVE-2026-54288"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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