by Kastro
Paper/Archive/CVE-2026-104480

CVE-2026-104480

Discord libdave — Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership

EPSS 0.4%CVSS 9.4
critical.is priorityof 100
35
CVSS 9.4 (CNA)9.4 / 10 × 3028.2Not in CISA KEV+300.0EPSS percentile 33.9.339 × 206.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
libdave1.1.0 – < 1.2.01.2.0CNA
libdave7b15f1fc16f159da0478aa6be909e38f1e957833 – < 9686fbaea864aa19f0675e486672b6a77811b6a19686fbaea864aa19f0675e486672b6a77811b6a1CNA

Scores by source

Bugcrowd (CNA)9.4CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchgithub.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1refgithub.com/discord/libdave/releases/tag/v1.2.0/cppwriteupdaveprotocol.comrefgithub.com/discord/libdave