CVE-2026-59896: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in honojs hono
A race condition vulnerability (CWE-362) exists in the honojs hono framework versions from 4.11.8 up to but not including 4.12.27. The issue arises because hono/jsx did not isolate context values per request during server-side rendering, allowing context data from a different in-flight request to be accessed after an await in an async component. This vulnerability has a CVSS score of 6.5 (medium severity) and is fixed in version 4.12.27.
AI Analysis
Technical Summary
The honojs hono framework versions >=4.11.8 and <4.12.27 suffer from a race condition due to improper synchronization of shared resources in server-side rendering. Specifically, context values (createContext, useContext, jsxRenderer, useRequestContext) were not isolated per request, enabling data leakage or improper data usage across concurrent requests after asynchronous operations. This flaw is addressed in version 4.12.27.
Potential Impact
This vulnerability can lead to exposure or misuse of context data from concurrent requests during server-side rendering, potentially causing confidentiality breaches (high impact on confidentiality) and integrity issues (low impact on integrity). Availability is not affected. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade to hono version 4.12.27 or later, where this race condition has been fixed. Patch status is confirmed by the version fix information. No additional vendor advisory is provided, so check the official honojs release notes for confirmation.
CVE-2026-59896: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in honojs hono
Description
A race condition vulnerability (CWE-362) exists in the honojs hono framework versions from 4.11.8 up to but not including 4.12.27. The issue arises because hono/jsx did not isolate context values per request during server-side rendering, allowing context data from a different in-flight request to be accessed after an await in an async component. This vulnerability has a CVSS score of 6.5 (medium severity) and is fixed in version 4.12.27.
CVSS v3.1
Score 6.5medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The honojs hono framework versions >=4.11.8 and <4.12.27 suffer from a race condition due to improper synchronization of shared resources in server-side rendering. Specifically, context values (createContext, useContext, jsxRenderer, useRequestContext) were not isolated per request, enabling data leakage or improper data usage across concurrent requests after asynchronous operations. This flaw is addressed in version 4.12.27.
Potential Impact
This vulnerability can lead to exposure or misuse of context data from concurrent requests during server-side rendering, potentially causing confidentiality breaches (high impact on confidentiality) and integrity issues (low impact on integrity). Availability is not affected. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade to hono version 4.12.27 or later, where this race condition has been fixed. Patch status is confirmed by the version fix information. No additional vendor advisory is provided, so check the official honojs release notes for confirmation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-07T16:40:07.984Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4e7ad4c9d9e3dbe36a7d77
Added to database: 07/08/2026, 16:29:08 UTC
Last enriched: 07/22/2026, 00:58:06 UTC
Last updated: 08/22/2026, 10:52:10 UTC
Views: 79
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