What is CVE-2026-24398?

CVE-2026-24398 is a medium-severity vulnerability in Honojs Hono, classified under Incorrect Regular Expression. CVSS score: 4.8/10. Published 2026-01-27.

How severe is CVE-2026-24398?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Honojs Hono

CVE-2026-24398

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.11.7, IP Restriction Middleware in Hono is vulnerable to an IP address validation bypass. The `IPV4_REGEX` pattern and `convertIPv4ToB…

EPSS: 0.000 (3.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Honojs Hono — versions < 4.11.7

Weakness classification (CWE)

CWE-185 — Incorrect Regular Expression

References

https://github.com/honojs/hono/security/advisories/GHSA-r354-f388-2fhh (x_refsource_CONFIRM)
https://github.com/honojs/hono/commit/edbf6eea8e6c26a3937518d4ed91d8666edeec37 (x_refsource_MISC)
https://github.com/honojs/hono/releases/tag/v4.11.7 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-24398?: CVE-2026-24398 is a medium-severity vulnerability in Honojs Hono, classified under Incorrect Regular Expression. CVSS score: 4.8/10. Published 2026-01-27.
How severe is CVE-2026-24398?: Medium severity. CVSS v3 base score is 4.8 out of 10.