CVE-2026-106072

CVE Enrichment

CVSS: 6.7 MEDIUM
EPSS: 0.62%
EPSS Percentile: 49.52%
CISA KEV: Not listed

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**.

Technical Details

CVSS Version: 3.0
CNA / NVD Source: [email protected]
Published: 24-Oct-2026 00:17
Last Modified: 24-Oct-2026 02:42
EPSS Date: 2026-10-30
CWE: CWE-295

CVSS Vector


            CVSS:3.0                            AV:N /
                            AC:L /
                            PR:H /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:L

References

[email protected]

Last enrichment sync: 31-Oct-2026 12:49
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (2)

Canonicalize IP addresses (CVE-2026-106069, CVE-2026-105483, CVE-2026-106072). Qualys Details Interim Mitigations for Node.js Flaws While Upgrades Roll Out
CVE-2026-106072 Medium TLS Improper certificate validation for unusual IPv4 representations 22.x, 24.x, 26.x Node.js Fixes 10 Vulnerabilities, Including Brotli Remote Code Execution Flaw

CVE (9)

MITRE ATT&CK (1)

Vendors (6)

Products (12)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.