CVE-2026-106072
CVE-2026-106072
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**.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| node nodejs |
≥ 22.23.3; ≤ 22.23.3 (affected, semver) ≥ 24.22.0; ≤ 24.22.0 (affected, semver) ≥ 26.12.0; ≤ 26.12.0 (affected, semver) Other versions: unaffected |
CNA: hackerone |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.0 / 6.7 medium |
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L | CNA: hackerone |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
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