Input validation error in hono - CVE-2026-44455
Published: July 24, 2026
Vulnerability identifier: #VU139285
CSH Severity: Medium
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44455
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to inject unintended HTML into the generated output.
The vulnerability exists due to improper input validation in hono/jsx server-side rendering via the jsx() or createElement() APIs when rendering untrusted input as JSX tag names. A remote attacker can supply a specially crafted tag name to inject unintended HTML into the generated output.
User interaction is required, and cross-site scripting may occur when combined with unsafe usage patterns.
Affected software
hono
How to mitigate CVE-2026-44455
Install security update from vendor's website.
hono - update to 4.12.16