hostname validation

About this tag
Hostname validation is a critical security check in TLS certificate verification, ensuring that the certificate's subject name matches the intended server. A recent vulnerability in Go's crypto/x509 package, CVE-2025-61729, demonstrates the risks: the HostnameError.Error method could cause quadratic runtime and denial of service when processing crafted certificates with many hostnames. This flaw, fixed in targeted Go releases, highlights the importance of proper hostname validation logic in software. For Windows users and developers, understanding hostname validation helps prevent man-in-the-middle attacks and availability issues in applications relying on Go's certificate verification.

  1. Go CVE-2025-61729 DoS in crypto x509 hostname validation

    A newly published vulnerability in Go's standard library, tracked as CVE-2025-61729, exposes a denial-of-service vector in the crypto/x509 package: the HostnameError.Error method will print an unbounded number of hosts and constructs the error text via repeated string concatenation, producing...
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    • crypto x509 denial of service go vulnerability hostname validation
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    • Forum: Security Alerts