CVE-2025-14822
published 2026-01-16CVE-2025-14822: Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources…
medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| github.com | mattermost_mattermost-server | >= 10.11.0 < 10.11.9 | 10.11.9 |
| github.com | mattermost_mattermost-server | >= 10.11.0+incompatible < 10.11.9+incompatible | 10.11.9+incompatible |
| github.com | mattermost_mattermost-server | >= 11.0.0 < 11.2.0 | 11.2.0 |
| github.com | mattermost_mattermost-server | >= 11.0.1+incompatible < 11.2.0+incompatible | 11.2.0+incompatible |
| mattermost | mattermost | 10.11.0 – 10.11.8 | — |
| mattermost | mattermost_server | >= 10.11.0 < 10.11.9 | 10.11.9 |