CVE-2026-59897

MEDIUM

Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication

Title source: cna
STIX 2.1

Description

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.

References (3)

Core 3

Scores

CVSS v3 4.8
EPSS 0.0013
EPSS Percentile 2.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-348
Status published
Products (3)
hono/hono 4.3.3 - 4.12.27
honojs/hono >= 4.3.3, < 4.12.27
npm/hono 4.3.3 - 4.12.27npm
Published Jul 08, 2026
Tracked Since Jul 08, 2026