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FKIE_CVE-2026-46600

Vulnerability from fkie_nvd - Published: 2026-07-21 20:17 - Updated: 2026-08-14 16:16
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.
References
security@golang.orghttps://go.dev/cl/786345
security@golang.orghttps://go.dev/issue/79795
security@golang.orghttps://groups.google.com/g/golang-announce/c/94pEornpRlI
security@golang.orghttps://pkg.go.dev/vuln/GO-2026-5942
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "net",
          "product": "net",
          "programRoutines": [
            {
              "name": "cgoResSearch"
            },
            {
              "name": "LookupCNAME"
            },
            {
              "name": "Resolver.LookupCNAME"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.26.6",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.0-rc.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/dns/dnsmessage",
          "product": "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"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.56.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@golang.org"
    }
  ],
  "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."
    }
  ],
  "id": "CVE-2026-46600",
  "lastModified": "2026-08-14T16:16:55.673",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-46600",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-23T15:00:27.171241Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-21T20:17:01.213",
  "references": [
    {
      "source": "security@golang.org",
      "url": "https://go.dev/cl/786345"
    },
    {
      "source": "security@golang.org",
      "url": "https://go.dev/issue/79795"
    },
    {
      "source": "security@golang.org",
      "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
    },
    {
      "source": "security@golang.org",
      "url": "https://pkg.go.dev/vuln/GO-2026-5942"
    }
  ],
  "sourceIdentifier": "security@golang.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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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.
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  • 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.