What is CVE-2026-44455?

CVE-2026-44455 is a medium-severity vulnerability in Hono, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-05-13.

How severe is CVE-2026-44455?

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

Vulnerability in Hono

CVE-2026-44455

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 ou…

EPSS: 0.000 (9.9th 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 < 4.12.16

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

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

Frequently asked questions

What is CVE-2026-44455?: CVE-2026-44455 is a medium-severity vulnerability in Hono, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-05-13.
How severe is CVE-2026-44455?: Medium severity. CVSS v3 base score is 4.7 out of 10.