CVE-2026-5132

Mattermost versions 11.9.x ≤ 11.9.0, 11.8.x ≤ 11.8.4, 11.7.x ≤ 11.7.7, and 10.11.x ≤ 10.11.22 fail to limit the size of unpacked SDP messages compressed with zlib in Calls WebSocket messages. An authenticated attacker (low privileges) can send many SDP messages that decompress to a large size, ca...