CVE-2026-46600

{
  "id": "CVE-2026-46600",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-21T20:17:01.213",
  "lastModified": "2026-10-24T19:10:00.127",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer."
    },
    {
      "lang": "es",
      "value": "Analizar un RR SVCB o HTTPS no válido puede causar un pánico cuando el tamaño de un valor de parámetro desborda el búfer del mensaje."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Go standard library",
          "product": "net",
          "defaultStatus": "unaffected",
          "collectionURL": "https://pkg.go.dev",
          "packageName": "net",
          "programRoutines": [
            {
              "name": "cgoResSearch"
            },
            {
              "name": "LookupCNAME"
            },
            {
              "name": "Resolver.LookupCNAME"
            }
          ],
          "versions": [
            {
              "version": "1.26.0-0",
              "lessThan": "1.26.6",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "1.27.0-0",
              "lessThan": "1.27.0-rc.3",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "golang.org/x/net",
          "product": "golang.org/x/net/dns/dnsmessage",
          "defaultStatus": "unaffected",
          "collectionURL": "https://pkg.go.dev",
          "packageName": "golang.org/x/net/dns/dnsmessage",
          "programRoutines": [
            {
              "name": "unpackSVCBResource"
            },
            {
              "name": "Message.Unpack"
            },
            {
              "name": "Parser.Additional"
            },
            {
              "name": "Parser.AllAdditionals"
            },
            {
              "name": "Parser.AllAnswers"
            },
            {
              "name": "Parser.AllAuthorities"
            },
            {
              "name": "Parser.Answer"
            },
            {
              "name": "Parser.Authority"
            },
            {
              "name": "Parser.HTTPSResource"
            },
            {
              "name": "Parser.SVCBResource"
            }
          ],
          "versions": [
            {
              "version": "0",
              "lessThan": "0.56.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-23T15:00:27.171241Z",
          "id": "CVE-2026-46600",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://go.dev/cl/786345",
      "source": "[email protected]"
    },
    {
      "url": "https://go.dev/issue/79795",
      "source": "[email protected]"
    },
    {
      "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
      "source": "[email protected]"
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2026-5942",
      "source": "[email protected]"
    }
  ]
}