{"id":"CVE-2026-54287","revision":null,"records":[{"revision":"4fc8df1f3ad149a5b54679e56b33ffea","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-54287","aliases":[],"title":"Hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attributes (for example Expires dates), clients cannot split the value back into individual cookies and silently drop or misparse them. This vulnerability is fixed in 4.12.25.","state":0,"publishedAt":"2026-06-22T17:13:14.947+00:00","modifiedAt":"2026-06-22T17:36:59.514+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:N/I:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-j6c9-x7qj-28xf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54287","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-54287","identifiers":["CVE-2026-54287"]},"retained":false,"historicalAffected":[]},{"revision":"dbce63a8a88545a9a0fb5dfb8893306c","observedAt":"2026-11-07T12:29:07.616+00:00","statement":{"source":"euvd","id":"EUVD-2026-38326","aliases":["CVE-2026-54287","GHSA-j6c9-x7qj-28xf"],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated …","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attributes (for example Expires dates), clients cannot split the value back into individual cookies and silently drop or misparse them. 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:N/I:L/A:N","score":5.3,"severity":null}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-j6c9-x7qj-28xf"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38326","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 22, 2026, 5:13:14 PM","dateUpdated":"Jun 22, 2026, 5:36:59 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-2026-38326","identifiers":["EUVD-2026-38326","CVE-2026-54287","GHSA-j6c9-x7qj-28xf"]},"retained":false,"historicalAffected":[]},{"revision":"a0edd9809cde4496bcd4e1de84ff6664","observedAt":"2026-10-27T14:13:32.924+00:00","statement":{"source":"nvd","id":"CVE-2026-54287","aliases":[],"title":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated …","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple Set-Cookie headers into one comma-separated value. Because commas also appear inside cookie attributes (for example Expires dates), clients cannot split the value back into individual cookies and silently drop or misparse them. This vulnerability is fixed in 4.12.25.","state":0,"publishedAt":"2026-06-22T18:16:47.35+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:N/I:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/honojs/hono/security/advisories/GHSA-j6c9-x7qj-28xf"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54287","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-116"],"productCriteria":[],"sourceDates":{"published":"2026-06-22T18:16:47.350","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-2026-54287","identifiers":["CVE-2026-54287"]},"retained":false,"historicalAffected":[]},{"revision":"debc63023dfc41119633b39aff608d38","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-j6c9-x7qj-28xf","aliases":["CVE-2026-54287"],"title":"hono: AWS Lambda adapter merges multiple `Set-Cookie` headers into one value, dropping cookies on ALB single-header and Lattice","description":"### Summary\n\nOn AWS Lambda, the ALB single-header response and the VPC Lattice v2 response join multiple `Set-Cookie` headers into one comma-separated value. Because commas also appear inside cookie attributes (for example `Expires` dates), clients cannot split the value back into individual cookies and silently drop or misparse them.\n\n### Details\n\nPer RFC 6265, each cookie must be its own `Set-Cookie` header line, and commas may appear inside attribute values. Joining cookies with `\", \"` collides with those commas, producing a value that clients cannot reliably split. Only ALB single-header mode and VPC Lattice v2 are affected; API Gateway v1/v2 and ALB with multi-value headers enabled already use an array and are unaffected.\n\n### Impact\n\nA client may receive only one of the cookies, a malformed cookie, or none. Session, CSRF, or preference cookies can silently fail to apply, breaking sessions or forcing re-authentication. This affects applications that set multiple cookies per response and run on AWS Lambda behind an ALB in single-header mode (the default) or VPC Lattice v2.","state":0,"publishedAt":"2026-06-16T14:08:40+00:00","modifiedAt":"2026-09-10T03:50:49.9668302+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:N/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-j6c9-x7qj-28xf","https://nvd.nist.gov/vuln/detail/CVE-2026-54287","https://github.com/honojs/hono"],"sourceUrl":"https://github.com/advisories/GHSA-j6c9-x7qj-28xf","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-j6c9-x7qj-28xf","identifiers":["GHSA-j6c9-x7qj-28xf","CVE-2026-54287"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-c5a2504558b549559b8658a653596391","complete":true,"records":13633,"lastAttemptAt":"2026-11-07T20:19:26.3099435+00:00","lastSuccessAt":"2026-11-07T20:19:26.304+00:00","error":null,"lastVerifiedAt":"2026-11-07T20:19:26.304+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. 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