Vulnerability · Published May 13, 2026 · Assigned by GitHub_M

CVE-2026-44455Hono: Unvalidated JSX Tag Names in hono/jsx May Allow HTML Injection

Medium 4.7

In plain English

A medium-severity injection in hono from honojs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium

Exploit odds (30 days)0.1%top 96.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	hono	4.12.16	GHSA-69xw-7hcm-h432

Affected products (as reported)

Vendor	Product	Versions
honojs	hono	< 4.12.16

Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/honojs/hono/security/advisories/GHSA-69xw-7hcm-h432 x_refsource_CONFIRM