GHSA-458j-xx4x-4375: hono Improperly Handles JSX Attribute Names Allows HTML Injection in hono/jsx SSR

April 16, 2026 (updated June 24, 2026)

Improper handling of JSX attribute names in hono/jsx allows malformed attribute keys to corrupt the generated HTML output.

When untrusted input is used as attribute keys during server-side rendering, specially crafted keys can break out of attribute or tag boundaries and inject unintended HTML.

References

github.com/advisories/GHSA-458j-xx4x-4375
github.com/honojs/hono/security/advisories/GHSA-458j-xx4x-4375
nvd.nist.gov/vuln/detail/CVE-2026-56761

Code Behaviors & Features

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