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    2 vulnerabilities found for mime by Go standard library

    CVE-2026-42504 (GCVE-0-2026-42504)

    Vulnerability from nvd – Published: 2026-06-02 22:01 – Updated: 2026-07-09 21:13
    VLAI
    Title
    Quadratic complexity in WordDecoder.DecodeHeader in mime
    Summary
    Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-407 - Inefficient Algorithmic Complexity
    Assigner
    Go
    References
    Impacted products
    Vendor Product Version
    Go standard library mime Affected: 0 , < 1.25.11 (semver)
    Affected: 1.26.0-0 , < 1.26.4 (semver)
    		Create a notification for this product.
    Credits
    p4p3r (https://hackerone.com/p4p3r_hak)
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-42504",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-03T14:05:39.682615Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-407",
                "description": "CWE-407 Inefficient Algorithmic Complexity",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-03T14:06:13.623Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "mime",
          "product": "mime",
          "programRoutines": [
            {
              "name": "WordDecoder.DecodeHeader"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.25.11",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.26.4",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "p4p3r (https://hackerone.com/p4p3r_hak)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-09T21:13:59.070Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/79217"
        },
        {
          "url": "https://go.dev/cl/774481"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5038"
        }
      ],
      "title": "Quadratic complexity in WordDecoder.DecodeHeader in mime"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-42504",
    "datePublished": "2026-06-02T22:01:37.219Z",
    "dateReserved": "2026-04-28T00:21:12.792Z",
    "dateUpdated": "2026-07-09T21:13:59.070Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-42504 (GCVE-0-2026-42504)

    Vulnerability from cvelistv5 – Published: 2026-06-02 22:01 – Updated: 2026-07-09 21:13
    VLAI
    Title
    Quadratic complexity in WordDecoder.DecodeHeader in mime
    Summary
    Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-407 - Inefficient Algorithmic Complexity
    Assigner
    Go
    References
    Impacted products
    Vendor Product Version
    Go standard library mime Affected: 0 , < 1.25.11 (semver)
    Affected: 1.26.0-0 , < 1.26.4 (semver)
    		Create a notification for this product.
    Credits
    p4p3r (https://hackerone.com/p4p3r_hak)
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-42504",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-03T14:05:39.682615Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-407",
                "description": "CWE-407 Inefficient Algorithmic Complexity",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-03T14:06:13.623Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "mime",
          "product": "mime",
          "programRoutines": [
            {
              "name": "WordDecoder.DecodeHeader"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.25.11",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.26.4",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "p4p3r (https://hackerone.com/p4p3r_hak)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-09T21:13:59.070Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/79217"
        },
        {
          "url": "https://go.dev/cl/774481"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5038"
        }
      ],
      "title": "Quadratic complexity in WordDecoder.DecodeHeader in mime"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-42504",
    "datePublished": "2026-06-02T22:01:37.219Z",
    "dateReserved": "2026-04-28T00:21:12.792Z",
    "dateUpdated": "2026-07-09T21:13:59.070Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}