What is CVE-2026-24771?

CVE-2026-24771 is a medium-severity vulnerability in Hono, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-01-27.

How severe is CVE-2026-24771?

Medium severity. CVSS v3 base score is 4.7 out of 10.

XSS in Hono

CVE-2026-24771

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.11.7, a Cross-Site Scripting (XSS) vulnerability exists in the `ErrorBoundary` component of the hono/jsx library. Under certain usage patterns, untrusted user-controlled strings may be rendered as raw HTML, allowing arbitrary script execution in the victim's browser. Version 4.11.7 patches the issue.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (22.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Hono
Honojs Hono — versions < 4.11.7

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-24771?: CVE-2026-24771 is a medium-severity vulnerability in Hono, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-01-27.
How severe is CVE-2026-24771?: Medium severity. CVSS v3 base score is 4.7 out of 10.