medium6.5
CVE-2026-93849
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 Mattermost fail to apply allocation limits to the byte-string dec…
Impact
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 Mattermost fail to apply allocation limits to the byte-string decode paths in its WebSocket msgpack decoder, which allows an authenticated remote attacker to cause excessive server memory allocation via a crafted binary WebSocket frame declaring a Bin32 payload length of up to 4,294,967,295 bytes.. Mattermost Advisory ID: MMSA-2026-00768
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mattermost | Mattermost Versions 11.9.X | through 11.9.1 |
| 11.8.X | through 11.8.5 | |
| 11.7.X | through 11.7.10 | |
| 11.10.X | through 11.10.1 |
Versions were read from the advisory text. No structured product data has been published for this record yet.