Is hono affected by CVE-2026-39409?

npm hono is affected in <4.12.12.

Is CVE-2026-39409 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

medium

CVE-2026-39409

Q: Is CVE-2026-39409 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

npm · hono

Summary

Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses

Severity: medium
EPSS: 0.3% (p26)
Also known as: GHSA-xpcf-pg52-r92g
Published: 2026-04-08

References

https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
https://nvd.nist.gov/vuln/detail/CVE-2026-39409
https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39

Related advisories

CVE-2026-54290 — high · npm/hono
CVE-2026-54288 — medium · npm/hono
CVE-2026-54289 — medium · npm/hono
CVE-2026-54286 — medium · npm/hono
CVE-2026-54287 — medium · npm/hono
CVE-2026-47676 — medium · npm/hono
CVE-2026-47674 — medium · npm/hono
CVE-2026-47675 — medium · npm/hono

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.