CVE Watch2 de nov. de 2026

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

CVSS

6.7

Média

EPSS

0.6%

p50

KEV

—

Exploit Today

0-100

Publicado: 23 de out. de 2026 · Última mod.: 2 de nov. de 2026 · CWE-295

EPSS · 30d

0.5%EPSS · 30 dias0.6%

2026-10-252026-11-07

Descrição técnica

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**.

Referências oficiais

nodejs.orghttps://nodejs.org/en/blog/vulnerability/october-2026-security-releases

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