Vulnerability-Lookup

CVE-2026-46600 (GCVE-0-2026-46600)

Vulnerability from cvelistv5 – Published: 2026-07-21 19:18 – Updated: 2026-07-23 15:00

Title

Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage

Summary

Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.

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-125 - Out-of-bounds Read

Assigner

References

3 references

URL	Tags
https://go.dev/cl/786345
https://go.dev/issue/79795
https://pkg.go.dev/vuln/GO-2026-5942

Impacted products

1 product

Vendor	Product	Version
golang.org/x/net	golang.org/x/net/dns/dnsmessage	Affected: 0 , < 0.56.0 (semver)

Credits

Mundur (https://github.com/M0nd0R)

Show details on NVD website

JSON

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-2026-46600",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-23T15:00:27.171241Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-125",
                "description": "CWE-125 Out-of-bounds Read",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-23T15:00:35.473Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Mundur (https://github.com/M0nd0R)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-21T19:18:59.755Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/786345"
        },
        {
          "url": "https://go.dev/issue/79795"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5942"
        }
      ],
      "title": "Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-46600",
    "datePublished": "2026-07-21T19:18:59.755Z",
    "dateReserved": "2026-05-15T17:35:00.814Z",
    "dateUpdated": "2026-07-23T15:00:35.473Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46600",
      "date": "2026-07-24",
      "epss": "0.00339",
      "percentile": "0.26318"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46600\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-07-21T20:17:01.213\",\"lastModified\":\"2026-07-23T18:27:48.877\",\"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.\"}],\"affected\":[{\"source\":\"security@golang.org\",\"affectedData\":[{\"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\":\"security@golang.org\"},{\"url\":\"https://go.dev/issue/79795\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-5942\",\"source\":\"security@golang.org\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-46600\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-23T15:00:27.171241Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-23T15:00:16.150Z\"}}], \"cna\": {\"title\": \"Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage\", \"credits\": [{\"lang\": \"en\", \"value\": \"Mundur (https://github.com/M0nd0R)\"}], \"affected\": [{\"vendor\": \"golang.org/x/net\", \"product\": \"golang.org/x/net/dns/dnsmessage\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.56.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/net/dns/dnsmessage\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"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\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/786345\"}, {\"url\": \"https://go.dev/issue/79795\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-5942\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-125: Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-07-21T19:18:59.755Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-46600\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-23T15:00:35.473Z\", \"dateReserved\": \"2026-05-15T17:35:00.814Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-07-21T19:18:59.755Z\", \"assignerShortName\": \"Go\"}",
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    }
  }
}

ubuntu-cve-2026-46600

Vulnerability from osv_ubuntu

Published

2026-07-23 00:00

Modified

2026-07-23 00:00

Summary

Details

(Parsing an invalid SVCB or HTTPS RR can panic when the size of a param ...)

Severity

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-46600	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-46600	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-1.23",
            "binary_version": "1.23.1-1~22.04.2"
          },
          {
            "binary_name": "golang-1.23-go",
            "binary_version": "1.23.1-1~22.04.2"
          },
          {
            "binary_name": "golang-1.23-src",
            "binary_version": "1.23.1-1~22.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "golang-1.23",
        "purl": "pkg:deb/ubuntu/golang-1.23@1.23.1-1~22.04.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.23.1-1~22.04",
        "1.23.1-1~22.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-1.23",
            "binary_version": "1.23.1-1~24.04.1"
          },
          {
            "binary_name": "golang-1.23-go",
            "binary_version": "1.23.1-1~24.04.1"
          },
          {
            "binary_name": "golang-1.23-src",
            "binary_version": "1.23.1-1~24.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "golang-1.23",
        "purl": "pkg:deb/ubuntu/golang-1.23@1.23.1-1~24.04.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.23.1-1~24.04",
        "1.23.1-1~24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-1.23",
            "binary_version": "1.23.10-1"
          },
          {
            "binary_name": "golang-1.23-go",
            "binary_version": "1.23.10-1"
          },
          {
            "binary_name": "golang-1.23-src",
            "binary_version": "1.23.10-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "golang-1.23",
        "purl": "pkg:deb/ubuntu/golang-1.23@1.23.10-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.23.10-1"
      ]
    }
  ],
  "aliases": [],
  "details": "(Parsing an invalid SVCB or HTTPS RR can panic when the size of a param ...)",
  "id": "UBUNTU-CVE-2026-46600",
  "modified": "2026-07-23T00:00:00Z",
  "published": "2026-07-23T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-46600"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46600"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-46600"
  ]
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-46600 (GCVE-0-2026-46600)

ubuntu-cve-2026-46600

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature