CVE-2026-105483
- State
- Published
- Severity
- 7.4 High
- Published
- Oct 23, 2026
- Updated
- Oct 23, 2026
- Reserved
- Oct 5, 2026
Description
A flaw in Node.js TLS hostname verification allows a certificate without a matching IP address SAN to authenticate a connection to an IPv4 address when the host is written with non-ASCII characters, such as fullwidth digits (`１２７.0.0.1`).
`tls.checkServerIdentity()` did not recognize such hosts as IP addresses, even though they normalize and resolve to a regular IPv4 address, and matched them against the certificate DNS names and Common Name instead. A certificate containing `DNS:127.0.0.1` or `DNS:*.0.0.1` could therefore be accepted for an IP endpoint it was not issued for. This is a regression introduced after the fix for CVE-2026-48618.
This vulnerability affects Node.js **26.x** and **24.x**.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.0 | 7.4 High | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | hackerone |
Weaknesses
- CWE-295 Improper Certificate Validation
Affected Products
| Product | Versions |
|---|---|
nodenodejs |
|
References
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