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CVE-2026-27145 is an algorithmic-complexity vulnerability in Go's crypto/x509 hostname verification. The affected (*x509.Certificate).VerifyHostname implementation invokes matchHostnames for each DNS Subject Alternative Name (SAN) entry, repeatedly splitting the same input hostname into labels. Processing cost grows with the product of the SAN entry count and hostname label count, producing quadratic behavior as both increase. Because x509.Verify checks hostnames before constructing the certificate chain, even an untrusted certificate can trigger excessive CPU consumption and denial of service.
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One of nine vulnerabilities covered by the Fedora 44 security update for gopass and gopass-jsonapi. The content does not describe its individual mechanism or identify which package specifically contains this flaw. Nessus checks self-reported versions rather than testing exploitation.
A computational-complexity vulnerability in stdlib X.509 hostname verification. Repeated hostname splitting across large DNS SAN lists causes excessive processing that can lead to denial of service. Hostname validation occurs before certificate-chain construction, so untrusted certificates can trigger the overhead. The advisory rates the vulnerability High, with a CVSS v3 base score of 7.5.
A denial-of-service vulnerability in Go's crypto/x509 package involving excessive processing of DNS Subject Alternative Name entries.
A denial-of-service vulnerability in Go's crypto/x509 package caused by excessive processing of DNS Subject Alternative Name (SAN) entries.
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