CVE-2026-47674: Hono is a Web application framework that provides support for any JavaScript runtime

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-47674 is a medium-severity flaw (CVSS 5.3) affecting hono. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the ip-restriction middleware (hono/ip-restriction) compares incoming IP addresses against configured deny and allow rules using string equality after partial normalization. Non-canonical IPv6 representations of an address already listed in a static rule — such as compressed forms, explicit-zero forms, or hex-notation IPv4-mapped addresses — do

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-185, CWE-1289
Published	2026-05-28
Last modified	2026-10-14

Publisher (CNA): GitHub, Inc. · Vendor: hono

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-28 17:16 UTCPublished CVE record published
2026-10-14 20:10 UTCUpdated Record last modified

hono hono UPGRADE

Affected: < 4.12.21

Fixed in: 4.12.21

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls hono

2. UPGRADE to 4.12.21

npm install hono@">=4.12.21"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47674?

hono: upgrade to 4.12.21. Exact commands for each OS are on this page.

Is CVE-2026-47674 being exploited?

CVE-2026-47674 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47674 affect?

CVE-2026-47674 affects hono. Severity is medium (CVSS 5.3). Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the ip-restriction middleware (hono/ip-restriction) compares incoming IP addresses against configured deny and allow rules using string

How urgent is CVE-2026-47674?

Priority 27/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-44456 MEDIUM 6.5 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-44457 MEDIUM 5.3 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-44455 MEDIUM 4.7 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-44458 MEDIUM 4.3 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-44459 LOW 3.8 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime

References

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