CVE-2026-59896: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in honojs hono
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.
AI Analysis
Technical Summary
The honojs hono framework versions >=4.11.8 and <4.12.27 have a concurrency issue where context values used in server-side rendering are shared across requests instead of being isolated. This improper synchronization (race condition) allows asynchronous components to access context data from other concurrent requests after an await, violating request isolation. This vulnerability is tracked as CVE-2026-59896 with a CVSS 3.1 score of 6.5 (medium severity). The issue is resolved in version 4.12.27.
Potential Impact
Exploitation of this vulnerability can lead to exposure of sensitive context data from other concurrent requests, resulting in confidentiality breaches (high impact on confidentiality). Integrity impact is low, and availability is not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade to hono version 4.12.27 or later, where the issue is fixed by isolating context values per request during server-side rendering. Since no official patch link or vendor advisory is provided, verify the upgrade from the official honojs release notes or repository. Patch status is confirmed by the version fix stated in the description.
CVE-2026-59896: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in honojs hono
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.
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 have a concurrency issue where context values used in server-side rendering are shared across requests instead of being isolated. This improper synchronization (race condition) allows asynchronous components to access context data from other concurrent requests after an await, violating request isolation. This vulnerability is tracked as CVE-2026-59896 with a CVSS 3.1 score of 6.5 (medium severity). The issue is resolved in version 4.12.27.
Potential Impact
Exploitation of this vulnerability can lead to exposure of sensitive context data from other concurrent requests, resulting in confidentiality breaches (high impact on confidentiality). Integrity impact is low, and availability is not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade to hono version 4.12.27 or later, where the issue is fixed by isolating context values per request during server-side rendering. Since no official patch link or vendor advisory is provided, verify the upgrade from the official honojs release notes or repository. Patch status is confirmed by the version fix stated in the description.
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: 07/08/2026, 16:44:06 UTC
Last updated: 07/08/2026, 17:37:50 UTC
Views: 3
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