CVE-2026-106072
- State
- Published
- Severity
- 6.7 Medium
- Published
- Oct 23, 2026
- Updated
- Oct 23, 2026
- Reserved
- Oct 6, 2026
Description
A flaw in Node.js TLS hostname verification allows a certificate with only a DNS SAN to authenticate an IP endpoint when the client connects using a non-canonical IPv4 spelling, such as `0177.0.0.1`, `0x7f.0.0.1`, `2130706433` or `127.1`.
`tls.checkServerIdentity()` did not classify these hosts as IP addresses, but normalized them to their canonical form and matched the result against the certificate DNS names. A certificate containing `DNS:127.0.0.1` and no `IP Address:127.0.0.1` SAN was therefore accepted, while the same certificate is correctly rejected for `127.0.0.1`. Exploitation requires a certificate with a numeric DNS SAN issued by a CA trusted by the client, and a platform resolver that accepts these spellings, such as glibc.
This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.0 | 6.7 Medium | CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L | hackerone |
Weaknesses
- CWE-295 Improper Certificate Validation
Affected Products
| Product | Versions |
|---|---|
nodenodejs |
|
References
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