{"cve":"CVE-2026-54289","nvd":{"published":"2026-06-22T18:16:47.480","modified":"2026-10-25T23:10:00.167","status":"Deferred","description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda@Edge, CloudFront delivers a request header that appears more than once as several separate entries. The adapter writes each value with Headers.set instead of Headers.append, so every value overwrites the previous one and only the last reaches the application. Repeated request headers such as X-Forwarded-For, Forwarded, and Via are silently truncated to a single value. Request middleware sees only the last value of a repeated header instead of the full chain. For applications that base access control on the X-Forwarded-For chain, this can weaken or alter that decision; for auditing, hop history is lost. This vulnerability is fixed in 4.12.25.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8},"cwes":["CWE-348"],"references":["https://github.com/honojs/hono/security/advisories/GHSA-wgpf-jwqj-8h8p","https://github.com/honojs/hono/security/advisories/GHSA-wgpf-jwqj-8h8p"],"products":[],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-54289","score":0.00178,"percentile":0.07359,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-wgpf-jwqj-8h8p","url":"https://osv.dev/vulnerability/GHSA-wgpf-jwqj-8h8p","summary":"hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest","modified":"2026-09-10T03:50:50.847189873Z","packages":[{"ecosystem":"npm","name":"hono","purl":"pkg:npm/hono","ranges":["<4.12.25"],"fixed":["4.12.25"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}