# CVE-2026-105483: CVE-2026-105483

Status: published. Published: 2026-10-23. Updated: 2026-11-02.

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**.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- nodejs / node: ≥ 24.22.0; ≤ 24.22.0 (affected, semver); ≥ 26.12.0; ≤ 26.12.0 (affected, semver). Source: CNA: hackerone

## Severity and prioritization

- CVSS 3.0: 7.4 (high); CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: CNA: hackerone

- CVSS 3.0: 7.4 (high); CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N; source: NVD: support@hackerone.com

- CISA KEV: No listing in collected sources

- EPSS: 0.30% as of 2026-11-02; percentile 23.23%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-295

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://nodejs.org/en/blog/vulnerability/october-2026-security-releases (CNA: hackerone)

- https://nodejs.org/en/blog/vulnerability/october-2026-security-releases (support@hackerone.com)

## Provenance

- CNA: hackerone: https://www.cve.org/CVERecord?id=CVE-2026-105483; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-105483; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-105483; retrieved 2026-11-02; source updated Not reported

Revision: 4d4c83d4c19f1dffeb8feee470b4a734e426a126e21d5055bfc3454d075a007f

Canonical: https://y2.dev/cve/CVE-2026-105483

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