`tls.checkServerIdentity()` normalizes the host following the WHATWG URL rules, which read a leading-zero octet as octal (`0127.0.0.1` becomes `87.0.0.1`), while the connection is made through the operating system resolver, which on some platforms such as macOS reads it as decimal (`127.0.0.1`). A server at the connected address can then be authenticated with a certificate issued for another IP address.
This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| nodejs | node | unaffected |
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Fri, 23 Oct 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw in Node.js TLS hostname verification can cause a server certificate to be validated against a different IP address than the one the client connected to, when the host is a non-canonical IPv4 literal with a leading zero, such as `0127.0.0.1`. `tls.checkServerIdentity()` normalizes the host following the WHATWG URL rules, which read a leading-zero octet as octal (`0127.0.0.1` becomes `87.0.0.1`), while the connection is made through the operating system resolver, which on some platforms such as macOS reads it as decimal (`127.0.0.1`). A server at the connected address can then be authenticated with a certificate issued for another IP address. This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**. | |
| Weaknesses | CWE-295 | |
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| Metrics |
cvssV3_0
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: hackerone
Published:
Updated: 2026-10-23T16:15:05.850Z
Reserved: 2026-10-06T15:00:00.654Z
Link: CVE-2026-106069
Vulnrichment
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NVD
Status : Received
Published: 2026-10-23T17:17:19.740
Modified: 2026-10-23T17:17:19.740
Link: CVE-2026-106069
Redhat
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OpenCVE Enrichment
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