CVE-2026-105482

About vulnerability

A flaw in Node.js DNS resolution allows hostnames containing a NUL byte to be silently truncated by the dns.resolve*() functions and dns.reverse(). This is an incomplete fix of CVE-2026-48930, which only covered dns.lookup() and the net/tls host options.

Because the name is passed to c-ares as a C string, resolving attacker.example\0.trusted.example queries attacker.example and returns its records without any error. Applications that validate a hostname, for example against a domain allowlist, and then resolve it with dns.resolve*() can act on records for a different name than the one they validated.

This vulnerability affects Node.js 26.x, 24.x, and 22.x.

Affected product:

AlmaLinux 9.2 ESU , Alpine Linux 3.23 , Alpine Linux 3.24 , Debian 10 , Debian 11 , Debian 12 , Debian 13 , EL 10 , EL 6 , EL 7 , EL 8 , EL 9 , TuxCare 9.6 ESU , TuxCare 9.8 ESU , Ubuntu 18.04 , Ubuntu 20.04 , Ubuntu 22.04 , Ubuntu 24.04 , Ubuntu 26.04

Affected packages:

nodejs @ 16.20.2 (+115 more)