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CVE-2026-27145 is a denial-of-service vulnerability in Go's standard library crypto/x509 package. The flaw is in hostname verification for X.509 certificates: (*x509.Certificate).VerifyHostname iterated over all DNS Subject Alternative Name entries and repeatedly invoked hostname-matching logic that split the same input hostname into labels for each SAN entry. When a certificate contains a very large number of DNS SAN entries, this repeated processing causes verification cost to grow quadratically with respect to the SAN list size and the hostname label count. Because x509.Verify performs hostname validation before certificate chain construction, the excessive computation is incurred even when the presented certificate is ultimately untrusted.
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A denial-of-service vulnerability in Go crypto/x509 caused by excessive processing of DNS SAN entries.
A denial-of-service vulnerability in Go's crypto/x509 component caused by excessive processing of DNS SAN entries.
A denial-of-service vulnerability in golang crypto/x509 caused by excessive processing of DNS SAN entries.
A denial-of-service vulnerability in Go crypto/x509 caused by excessive processing of DNS SAN entries.
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