---
title: "CVE-2026-105483: Node.js - Authentication Bypass"
description: "Node.js 24.x and 26.x contain a broken authentication caused by improper TLS hostname verification allowing certificates with non-matching IP SANs to authenticate IPv4 addresses with non-ASCII characters, letting attackers impersonate IP endpoints, exploit requires crafted certificate and hostname."
url: https://panop.io/threat-heartbeat/CVE-2026-105483/
---

# CVE-2026-105483 Node.js - Authentication Bypass

Node.js 24.x and 26.x contain a broken authentication caused by improper TLS hostname verification allowing certificates with non-matching IP SANs to authenticate IPv4 addresses with non-ASCII characters, letting attackers impersonate IP endpoints, exploit requires crafted certificate and hostname.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

Proof of concept available

EPSS

0.24% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105483)

## Details

Type

Authentication Bypass

Impact

Man In The Middle

CVSS vector

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

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-295](https://cwe.mitre.org/data/definitions/295.html)

## Vendor fix

Update to the latest Node.js 24.x or 26.x versions with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105483](https://nvd.nist.gov/vuln/detail/CVE-2026-105483)
- [https://nodejs.org/en/blog/vulnerability/october-2026-security-releases](https://nodejs.org/en/blog/vulnerability/october-2026-security-releases)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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