Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership
Published Oct 2, 2026
9.4
CRITICALCVSS 4.0
Description
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.
Affected products
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- Version 1.1.0StatusaffectedConstraints<1.2.0
- Version
-
- Version StatusaffectedConstraints
- Version
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
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
1 other source (NVD) ▾
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
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
No EPSS score for this CVE.
References (4)
- https://daveprotocol.com/ technical-description
- https://github.com/discord/libdave product
- https://github.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1 patch
- https://github.com/discord/libdave/releases/tag/v1.2.0/cpp release-notes
| Link | Providers | Tags |
|---|---|---|
| https://daveprotocol.com/ | technical-description | |
| https://github.com/discord/libdave | product | |
| https://github.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1 | patch | |
| https://github.com/discord/libdave/releases/tag/v1.2.0/cpp | release-notes |
Change history (0)
No recorded changes yet.