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CVE-2026-59897— Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication

Quick assessment

Affected
honojs hono
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hono是Hono团队开源的一个用 TypeScript 编写的 Web 框架。 Hono 4.3.3版本至4.12.27之前版本存在信任管理问题漏洞，该漏洞源于AWS API Gateway v1适配器使用子字符串比较代替精确匹配来去重重复请求头值，可能丢弃不同的重复请求头值，导致依赖完整X-Forwarded-For链、速率限制、审计日志或代理链验证的中间件或应用逻辑接收不完整数据。

CVSS 4.8 · Medium EPSS 0.18% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono >= 4.3.3, < 4.12.27 affected
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I. Basic Information for CVE-2026-59897

Vulnerability Information
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Vulnerability Title
Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-duplication
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不可信的源
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono团队开源的一个用 TypeScript 编写的 Web 框架。 Hono 4.3.3版本至4.12.27之前版本存在信任管理问题漏洞，该漏洞源于AWS API Gateway v1适配器使用子字符串比较代替精确匹配来去重重复请求头值，可能丢弃不同的重复请求头值，导致依赖完整X-Forwarded-For链、速率限制、审计日志或代理链验证的中间件或应用逻辑接收不完整数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs hono >= 4.3.3, < 4.12.27 -

II. Public POCs for CVE-2026-59897

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III. Intelligence Information for CVE-2026-59897

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Patches & Fixes for CVE-2026-59897 (1)

Vendor Advisories for CVE-2026-59897 (1)

Vendor Pages for CVE-2026-59897 (1)

Same Patch Batch · honojs · 2026-07-08 · 3 CVEs total

CVE-2026-59896 6.5 MEDIUM hono/jsx does not isolate context per request, leading to cross-request data disclosure
CVE-2026-59895 6.1 MEDIUM Hono: Server-Side XSS via JSX Escaping Bypass in cx() Utility

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-348

V. Comments for CVE-2026-59897

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