A flaw in Node.js TLS hostname verification allows a certificate without a matching IP address SAN to authenticate a connection to an IPv4 address when the host is written with non-ASCII characters, such as fullwidth digits (`１２７.0.0.1`). `tls.checkServerIdentity()` did not recognize such hosts as IP addresses, even though they normalize and resolve to a regular IPv4 address, and matched them against the certificate DNS names and Common Name instead. A certificate containing `DNS:127.0.0.1` or `DNS:*.0.0.1` could therefore be accepted for an IP endpoint it was not issued for. This is a regression introduced after the fix for CVE-2026-48618. This vulnerability affects Node.js **26.x** and **24.x**.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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**. (CVE-2026-106072)

  - A flaw in Node.js HTTP Agent connection reuse can cause a client to accept as valid a response that was
    sent before the client has sent the request. This is an incomplete fix of CVE-2026-48931. The guard that
    destroys idle keep-alive sockets when unexpected data arrives only runs when the event loop polls for I/O.
    If an unsolicited response has already reached the socket but has not been read yet when the socket is
    handed to a new request, for example because the event loop was busy with synchronous work, the guard is
    removed without seeing it and the data is parsed as the response to the new request. This vulnerability
    affects Node.js **26.x**, **24.x**, and **22.x**. (CVE-2026-105481)

  - 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. (CVE-2026-105482)

  - A flaw in Node.js TLS hostname verification allows a certificate without a matching IP address SAN to
    authenticate a connection to an IPv4 address when the host is written with non-ASCII characters, such as
    fullwidth digits (`１２７.0.0.1`). `tls.checkServerIdentity()` did not recognize such hosts as IP addresses,
    even though they normalize and resolve to a regular IPv4 address, and matched them against the certificate
    DNS names and Common Name instead. A certificate containing `DNS:127.0.0.1` or `DNS:*.0.0.1` could
    therefore be accepted for an IP endpoint it was not issued for. This is a regression introduced after the
    fix for CVE-2026-48618. This vulnerability affects Node.js **26.x** and **24.x**. (CVE-2026-105483)

  - 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**.
    (CVE-2026-106069)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw in Node.js TLS hostname verification allows a certificate without a matching IP address SAN to     authenticate a connection to an IPv4 address when the host is written with non-ASCII characters, such as     fullwidth digits (`.0.0.1`). `tls.checkServerIdentity()` did not recognize such hosts as IP addresses,     even though they normalize and resolve to a regular IPv4 address, and matched them against the certificate     DNS names and Common Name instead. A certificate containing `DNS:127.0.0.1` or `DNS:*.0.0.1` could     therefore be accepted for an IP endpoint it was not issued for. This is a regression introduced after the     fix for CVE-2026-48618. This vulnerability affects Node.js **26.x** and **24.x**. (CVE-2026-105483)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Node.js installed on the remote host is 24.x prior to 24.22.1 or 26.x prior to 26.12.1. It is, therefore, affected by a TLS certificate hostname bypass vulnerability as referenced in the Wednesday, October 21, 2026 Security Releases advisory.

  - TLS certificate hostname verification can be bypassed when the IP address is written using fullwidth     digits. (CVE-2026-105483)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
477145	Alpine: multiple nodejs packages: security update to 24.22.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	high
477145	Alpine: multiple nodejs packages: security update to 24.22.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	high
370554	Linux Distros Unpatched Vulnerability : CVE-2026-105483	Nessus	Misc.	Local	high
370489	Node.js 24.x < 24.22.1 / 26.x < 26.12.1 TLS Certificate Hostname Bypass	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-105483

high

Tenable Plugins

high

high

high

high