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Description
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.
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[{"vendor":"Go standard library","product":"crypto/x509","defaultStatus":"unaffected","collectionURL":"https://pkg.go.dev","packageName":"crypto/x509","programRoutines":[{"name":"HostnameError.Error"},{"name":"matchHostnames"},{"name":"Certificate.Verify"},{"name":"Certificate.VerifyHostname"}],"versions":[{"version":"0","lessThan":"1.25.11","versionType":"semver","status":"affected"},{"version":"1.26.0-0","lessThan":"1.26.4","versionType":"semver","status":"affected"}]}]
CVE Modified by CISA-ADP6/04/2026 10:16:39 AM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
New CVE Received from Go Project6/02/2026 7:16:35 PM
Action
Type
Old Value
New Value
Added
Description
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
