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CVE-2026-27145 Inefficient candidate hostname parsing in crypto/x509

🗓️ 02 Jun 2026 22:01:36Reported by GoType 
cvelist
 cvelist
🔗 www.cve.org👁 28 Views

CVE-2026-27145: Inefficient hostname parsing in crypto/x509 VerifyHostname causes quadratic cost with large DNS SANs.

Related
Affected
Refs
[
  {
    "vendor": "Go standard library",
    "product": "crypto/x509",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "crypto/x509",
    "versions": [
      {
        "version": "0",
        "lessThan": "1.25.11",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.26.0-0",
        "lessThan": "1.26.4",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "HostnameError.Error"
      },
      {
        "name": "matchHostnames"
      },
      {
        "name": "Certificate.Verify"
      },
      {
        "name": "Certificate.VerifyHostname"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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