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CVE-2026-39820 Quadratic string concatentation in consumeComment in net/mail

🗓️ 07 May 2026 19:41:19Reported by GoType 
cvelist
 cvelist
🔗 www.cve.org👁 29 Views

CVE-2026-39820 causes CPU exhaustion from quadratic string concatenation in consumeComment.

Related
Affected
Refs
[
  {
    "vendor": "Go standard library",
    "product": "net/mail",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "net/mail",
    "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": "addrParser.consumeComment"
      },
      {
        "name": "AddressParser.Parse"
      },
      {
        "name": "AddressParser.ParseList"
      },
      {
        "name": "Header.AddressList"
      },
      {
        "name": "Header.Date"
      },
      {
        "name": "ParseAddress"
      },
      {
        "name": "ParseAddressList"
      },
      {
        "name": "ParseDate"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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