CVE-2026-42499 (GCVE-0-2026-42499)

Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-07 19:41
VLAI?
Title
Quadratic string concatenation in consumePhrase in net/mail
Summary
Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
Severity ?
No CVSS data available.
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
Go
References
Impacted products
Vendor Product Version
Go standard library net/mail Affected: 0 , < 1.25.10 (semver)
Affected: 1.26.0-0 , < 1.26.3 (semver)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "net/mail",
          "product": "net/mail",
          "programRoutines": [
            {
              "name": "addrParser.consumePhrase"
            },
            {
              "name": "AddressParser.Parse"
            },
            {
              "name": "AddressParser.ParseList"
            },
            {
              "name": "Header.AddressList"
            },
            {
              "name": "ParseAddress"
            },
            {
              "name": "ParseAddressList"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.25.10",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.26.3",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-07T19:41:18.615Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/78987"
        },
        {
          "url": "https://go.dev/cl/771520"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-4977"
        }
      ],
      "title": "Quadratic string concatenation in consumePhrase in net/mail"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-42499",
    "datePublished": "2026-05-07T19:41:18.615Z",
    "dateReserved": "2026-04-28T00:21:12.791Z",
    "dateUpdated": "2026-05-07T19:41:18.615Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-42499\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-05-07T20:16:44.540\",\"lastModified\":\"2026-05-07T20:33:39.270\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://go.dev/cl/771520\",\"source\":\"security@golang.org\"},{\"url\":\"https://go.dev/issue/78987\",\"source\":\"security@golang.org\"},{\"url\":\"https://groups.google.com/g/golang-announce/c/qcCIEXso47M\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-4977\",\"source\":\"security@golang.org\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.