CVE-2026-59897 — Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated requ…
Published: 2026-07-08 · CVSS: 4.8 · CVSS 3.1
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated request header value because it de-duplicates values using a substring comparison instead of an exact match, so middleware or application logic that depends on the complete X-Forwarded-For chain, rate limiting, audit logging, or proxy-chain validation can receive incomplete data. This issue is fixed in version 4.12.27.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7