Preliminary research

Unicode-dot normalization bypasses Node.js TLS wildcard depth checks

Node.js TLS Wildcard Validation Bypass via Unicode Dot Separators

AI-collected research leads through 22 September 2026, including targeted additions between broader sweeps. Unranked, incomplete, not community-vetted, and subject to change.

Normalizes Unicode dot separators before wildcard hostname validation and supplies a regression test for resolver/verifier disagreement. The change prevents a certificate wildcard from matching an apparent single label that becomes multiple DNS labels when the hostname is normalized for connection establishment.

Record

Document

Node.js TLS Wildcard Validation Bypass via Unicode Dot Separators

Published by

Node.js project

Topic

Server

In the archive

• Collected in the 2026 preliminary research sweep

Related sources

• Fix Unicode-Dot Hostname Normalization in TLS Verification Code

Tags

• nodejs
• tls
• unicode
• parser-differential
• mitigation
• owasp-a02-2021

This page is the archive's own catalogue record. The research is the work of Node.js project, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 13 September 2026.