CVE-2026-47674 json
Hono: IP Restriction bypasses static deny rules for non-canonical IPv6
published 5mo ago modified 28d ago also EUVD-2026-32926 , GHSA-xrhx-7g5j-rcj5
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
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 not match the normalized rule entry, causing the rule to be silently skipped. This vulnerability is fixed in 4.12.21.
Patch / fix
- npm hono 4.12.21
- hono hono 4.12.21
Is CVE-2026-47674 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | hono | <4.12.21 |
4.12.21 |
Affected products
- honojs hono
Classification
References
-
github.com
/honojs/hono/commit/c831020fb1fa2e929d222f6c84e1abfe013e512b
web
-
github.com
/honojs/hono/security/advisories/GHSA-xrhx-7g5j-rcj5
web, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-47674
advisory
-
github.com
/honojs/hono
package
-
github.com
/honojs/hono/releases/tag/v4.12.21
web
Sources
- CVE List CVE-2026-47674
- GitHub Advisory GHSA-xrhx-7g5j-rcj5
- NVD CVE-2026-47674
- Maintainer advisory GHSA-xrhx-7g5j-rcj5
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of honojs/hono published their own advisory on GitHub. Reviewed sources take precedence over it.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.