Web Application Framework Vulnerability in Hono by HonoJS
CVE-2026-44458

4.3MEDIUM

Key Information:

Vendor

Honojs

Status
Hono
Vendor
CVE Published:
13 May 2026

What is CVE-2026-44458?

The Hono web application framework exhibits a vulnerability where the JSX renderer fails to escape style attribute object values appropriately for CSS. As a result, an attacker can inject additional CSS declarations through untrusted input in style object values or property names. This can lead to improper CSS handling and manipulation, although it does not enable JavaScript execution or HTML attribute breakout. The vulnerability was addressed in version 4.12.18, which mitigates the risk effectively.

Affected Version(s)

hono < 4.12.18

References

https://github.com/honojs/hono/security/advisories/GHSA-q...
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CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.