CVE-2026-106069 (GCVE-0-2026-106069)

Vulnerability from cvelistv5 – Published: 2026-10-23 16:15 – Updated: 2026-10-23 16:15
VLAI
Summary
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**.
Severity
7.4 (High)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
hackerone CNA under the mitre root
CNA scorecard D 59/100 over 195 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
nodejs node Affected: 22.23.3 , ≤ 22.23.3 (semver)
Affected: 24.22.0 , ≤ 24.22.0 (semver)
Affected: 26.12.0 , ≤ 26.12.0 (semver)
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        "shortName": "hackerone"
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    "datePublished": "2026-10-23T16:15:05.850Z",
    "dateReserved": "2026-10-06T15:00:00.654Z",
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      "title": "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`.\n\n`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.\n\nThis vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-106069.json",
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          }
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        "metrics": {
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                "confidentialityImpact": "HIGH",
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}



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