What is CVE-2026-47676?

CVE-2026-47676 is a medium-severity vulnerability in Hono, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.3/10. Published 2026-05-28.

How severe is CVE-2026-47676?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Hono

CVE-2026-47676

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route matching is performed agains…

Vulnerability class: HTTP Request Smuggling

EPSS: 0.001 (20.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Hono
Honojs Hono — versions < 4.12.21

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2026-47676?: CVE-2026-47676 is a medium-severity vulnerability in Hono, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.3/10. Published 2026-05-28.
How severe is CVE-2026-47676?: Medium severity. CVSS v3 base score is 5.3 out of 10.