Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership
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.
CVE-2026-104480
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-104480
libdave
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/discord/libdave",
"vendor": "Discord",
"modules": [
"C++ library"
],
"product": "libdave",
"versions": [
{
"status": "affected",
"version": "1.1.0",
"lessThan": "1.2.0",
"versionType": "semver"
},
{
"status": "affected",
"version": "7b15f1fc16f159da0478aa6be909e38f1e957833",
"lessThan": "9686fbaea864aa19f0675e486672b6a77811b6a1",
"versionType": "git"
}
],
"packageName": "discord/libdave",
"programFiles": [
"cpp/src/mls/session.cpp"
],
"collectionURL": "https://github.com",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "discord::dave::mls::Session::VerifyWelcomeState"
}
]
}
]- Related CVEs
- CVE-2026-104480
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #8124 · Revision 1
- Added to Heist Feed
- Publisher date