FKIE_CVE-2026-104480

Vulnerability from fkie_nvd - Published: 2026-10-02 02:17 - Updated: 2026-10-02 19:16
Severity
9.4 (Critical) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Summary
Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path (the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client) could cause affected clients to accept an unauthorized member into the end-to-end encrypted media session, compromising the confidentiality and integrity of audio and video.
References
4ac701fe-44e9-4bcd-9585-dd6449257611https://daveprotocol.com/
4ac701fe-44e9-4bcd-9585-dd6449257611https://github.com/discord/libdave
4ac701fe-44e9-4bcd-9585-dd6449257611https://github.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1
4ac701fe-44e9-4bcd-9585-dd6449257611https://github.com/discord/libdave/releases/tag/v1.2.0/cpp
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "modules": [
            "C++ library"
          ],
          "packageName": "discord/libdave",
          "product": "libdave",
          "programFiles": [
            "cpp/src/mls/session.cpp"
          ],
          "programRoutines": [
            {
              "name": "discord::dave::mls::Session::VerifyWelcomeState"
            }
          ],
          "repo": "https://github.com/discord/libdave",
          "vendor": "Discord",
          "versions": [
            {
              "lessThan": "1.2.0",
              "status": "affected",
              "version": "1.1.0",
              "versionType": "semver"
            },
            {
              "lessThan": "9686fbaea864aa19f0675e486672b6a77811b6a1",
              "status": "affected",
              "version": "7b15f1fc16f159da0478aa6be909e38f1e957833",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "4ac701fe-44e9-4bcd-9585-dd6449257611"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path (the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client) could cause affected clients to accept an unauthorized member into the end-to-end encrypted media session, compromising the confidentiality and integrity of audio and video."
    }
  ],
  "id": "CVE-2026-104480",
  "lastModified": "2026-10-02T19:16:41.020",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.4,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "4ac701fe-44e9-4bcd-9585-dd6449257611",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-104480",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-02T18:18:39.777597Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-02T02:17:02.007",
  "references": [
    {
      "source": "4ac701fe-44e9-4bcd-9585-dd6449257611",
      "url": "https://daveprotocol.com/"
    },
    {
      "source": "4ac701fe-44e9-4bcd-9585-dd6449257611",
      "url": "https://github.com/discord/libdave"
    },
    {
      "source": "4ac701fe-44e9-4bcd-9585-dd6449257611",
      "url": "https://github.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1"
    },
    {
      "source": "4ac701fe-44e9-4bcd-9585-dd6449257611",
      "url": "https://github.com/discord/libdave/releases/tag/v1.2.0/cpp"
    }
  ],
  "sourceIdentifier": "4ac701fe-44e9-4bcd-9585-dd6449257611",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-390"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "4ac701fe-44e9-4bcd-9585-dd6449257611",
      "type": "Secondary"
    }
  ]
}



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