CVE-2026-59897

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.

CVSS v3 4.8 MEDIUM

4.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd	Patch
https://github.com/honojs/hono/releases/tag/v4.12.27	Release Notes
https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*

History

10 Jul 2026, 19:50

Type	Values Removed	Values Added
First Time		Hono Hono hono
CPE		cpe:2.3:a:hono:hono::::::node.js::*
References	~~() https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd -~~	() https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd - Patch
References	~~() https://github.com/honojs/hono/releases/tag/v4.12.27 -~~	() https://github.com/honojs/hono/releases/tag/v4.12.27 - Release Notes
References	~~() https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc -~~	() https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc - Vendor Advisory

08 Jul 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-08 17:17

Updated : 2026-07-10 19:50

NVD link : CVE-2026-59897

Mitre link : CVE-2026-59897

CVE.ORG link : CVE-2026-59897

JSON object : View

Products Affected

hono

hono

CWE

CWE-348

Use of Less Trusted Source

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