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CVE-2026-33811 Crash when handling long CNAME response in net

🗓️ 07 May 2026 19:41:19Reported by GoType 
cvelist
 cvelist
🔗 www.cve.org👁 27 Views

CVE-2026-33811 causes a crash due to a double-free in C memory when handling very long CNAME responses in net LookupCNAME with the Go resolver.

Related
Affected
Refs
[
  {
    "vendor": "Go standard library",
    "product": "net",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "net",
    "versions": [
      {
        "version": "0",
        "lessThan": "1.25.10",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.26.0-0",
        "lessThan": "1.26.3",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "cgoResSearch"
      },
      {
        "name": "LookupCNAME"
      },
      {
        "name": "Resolver.LookupCNAME"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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