What is CVE-2026-44458?

CVE-2026-44458 is a medium-severity vulnerability in Hono, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.3/10. Published 2026-05-13.

How severe is CVE-2026-44458?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Hono

CVE-2026-44458

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.18, the JSX renderer escapes style attribute object values for HTML but not for CSS. Untrusted input in a style object value or property na…

EPSS: 0.000 (13.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Hono
Honojs Hono — versions < 4.12.18

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)
CWE-116 — Improper Encoding or Escaping of Output

References

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

Frequently asked questions

What is CVE-2026-44458?: CVE-2026-44458 is a medium-severity vulnerability in Hono, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.3/10. Published 2026-05-13.
How severe is CVE-2026-44458?: Medium severity. CVSS v3 base score is 4.3 out of 10.