CVE-2026-44455: CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in honojs hono
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.16, Improper handling of JSX element tag names in hono/jsx allowed unvalidated tag names to be directly inserted into the generated HTML output. When untrusted input is used as a tag name via the programmatic jsx() or createElement() APIs during server-side rendering, specially crafted values may break out of the intended element context and inject unintended HTML. This vulnerability is fixed in 4.12.16.
AI Analysis
Technical Summary
The vulnerability in hono versions before 4.12.16 arises from improper handling of JSX element tag names in hono/jsx. When untrusted input is used as a tag name via the jsx() or createElement() APIs during server-side rendering, specially crafted input can break out of the intended element context and inject unintended HTML. This is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component). The CVSS 3.1 base score is 4.7 (medium severity), reflecting network attack vector, high attack complexity, no privileges required, user interaction required, and partial impact on confidentiality and integrity. The vulnerability is resolved in hono version 4.12.16.
Potential Impact
An attacker who can supply untrusted input as JSX element tag names during server-side rendering may cause injection of unintended HTML content. This can lead to partial confidentiality and integrity impacts within the affected application context. There are no reports of known exploits in the wild. The vulnerability does not affect availability.
Mitigation Recommendations
Upgrade hono to version 4.12.16 or later, where this vulnerability is fixed. Since the vendor advisory indicates the issue is resolved in this version, applying this official fix is the recommended remediation. No other mitigation guidance is provided or necessary.
CVE-2026-44455: CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in honojs hono
Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.16, Improper handling of JSX element tag names in hono/jsx allowed unvalidated tag names to be directly inserted into the generated HTML output. When untrusted input is used as a tag name via the programmatic jsx() or createElement() APIs during server-side rendering, specially crafted values may break out of the intended element context and inject unintended HTML. This vulnerability is fixed in 4.12.16.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in hono versions before 4.12.16 arises from improper handling of JSX element tag names in hono/jsx. When untrusted input is used as a tag name via the jsx() or createElement() APIs during server-side rendering, specially crafted input can break out of the intended element context and inject unintended HTML. This is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component). The CVSS 3.1 base score is 4.7 (medium severity), reflecting network attack vector, high attack complexity, no privileges required, user interaction required, and partial impact on confidentiality and integrity. The vulnerability is resolved in hono version 4.12.16.
Potential Impact
An attacker who can supply untrusted input as JSX element tag names during server-side rendering may cause injection of unintended HTML content. This can lead to partial confidentiality and integrity impacts within the affected application context. There are no reports of known exploits in the wild. The vulnerability does not affect availability.
Mitigation Recommendations
Upgrade hono to version 4.12.16 or later, where this vulnerability is fixed. Since the vendor advisory indicates the issue is resolved in this version, applying this official fix is the recommended remediation. No other mitigation guidance is provided or necessary.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-06T15:49:25.192Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a049721cbff5d8610e00ed2
Added to database: 5/13/2026, 3:22:09 PM
Last enriched: 5/13/2026, 3:38:09 PM
Last updated: 5/14/2026, 6:46:05 AM
Views: 3
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