Node.js up to 24.22.0/26.12.0 TLS Hostname Verification tls.checkServerIdentity certificate validation

Summaryinfo

A vulnerability was found in Node.js up to 24.22.0/26.12.0 and classified as problematic. Affected is the function tls.checkServerIdentity of the component TLS Hostname Verification. Such manipulation leads to certificate validation. This vulnerability is documented as CVE-2026-105483. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Node.js up to 24.22.0/26.12.0. It has been rated as problematic. Affected by this issue is the function tls.checkServerIdentity of the component TLS Hostname Verification. The manipulation with an unknown input leads to a certificate validation vulnerability. Using CWE to declare the problem leads to CWE-295. The product does not validate, or incorrectly validates, a certificate. Impacted is integrity. CVE summarizes:

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**.

The advisory is shared for download at nodejs.org. This vulnerability is handled as CVE-2026-105483 since 10/05/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/23/2026). The MITRE ATT&CK project declares the attack technique as T1587.003.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• JavaScript Library

Name

• Node.js

Version

• 24.0
• 24.1
• 24.2
• 24.3
• 24.4
• 24.5
• 24.6
• 24.7
• 24.8
• 24.9
• 24.10
• 24.11
• 24.12
• 24.13
• 24.14
• 24.15
• 24.16
• 24.17
• 24.18
• 24.19
• 24.20
• 24.21
• 24.22.0
• 26.0
• 26.1
• 26.2
• 26.3
• 26.4
• 26.5
• 26.6
• 26.7
• 26.8
• 26.9
• 26.10
• 26.11
• 26.12.0

License

• open-source

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CPE 2.2info

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