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CVE-2026-59896— hono/jsx does not isolate context per request, leading to cross-request data disclosure

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 4.11.8版本至4.12.27之前版本存在竞争条件问题漏洞，该漏洞源于hono/jsx在服务器端渲染期间未按请求隔离环境值，允许在异步组件中await后使用来自不同进行中请求的createContext、useContext、jsxRenderer或useRequestContext数据。

CVSS 6.5 · Medium EPSS 0.30% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono >= 4.11.8, < 4.12.27 affected
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I. Basic Information for CVE-2026-59896

Vulnerability Information
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Vulnerability Title
hono/jsx does not isolate context per request, leading to cross-request data disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.11.8 before 4.12.27, hono/jsx did not isolate context values per request during server-side rendering, allowing createContext, useContext, jsxRenderer, or useRequestContext data from a different in-flight request to be used after an await in an async component. 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:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 竞争条件问题漏洞
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 4.11.8版本至4.12.27之前版本存在竞争条件问题漏洞，该漏洞源于hono/jsx在服务器端渲染期间未按请求隔离环境值，允许在异步组件中await后使用来自不同进行中请求的createContext、useContext、jsxRenderer或useRequestContext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 >= 4.11.8, < 4.12.27 -

II. Public POCs for CVE-2026-59896

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III. Intelligence Information for CVE-2026-59896

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Vendor Advisories for CVE-2026-59896 (1)

Vendor Pages for CVE-2026-59896 (1)

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

CVE-2026-59895 6.1 MEDIUM Hono: Server-Side XSS via JSX Escaping Bypass in cx() Utility
CVE-2026-59897 4.8 MEDIUM Hono: API Gateway v1 adapter can drop a distinct repeated request header value during de-d

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-362

V. Comments for CVE-2026-59896

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