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…
PriorityP336medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.32%
24.1th percentile
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 |
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OSV
Mattermost is vulnerable to CPU exhaustion via crafted HTTP request in github.com/mattermost/mattermost-server
osv·2026-02-26
CVE-2025-14822 Mattermost is vulnerable to CPU exhaustion via crafted HTTP request in github.com/mattermost/mattermost-server
Mattermost is vulnerable to CPU exhaustion via crafted HTTP request in github.com/mattermost/mattermost-server
Mattermost is vulnerable to CPU exhaustion via crafted HTTP request in github.com/mattermost/mattermost-server.
NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.
(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)
The additional affected modules and versions are: .
OSV
Mattermost is vulnerable to CPU exhaustion via crafted HTTP request
osv·2026-01-16
CVE-2025-14822 [LOW] Mattermost is vulnerable to CPU exhaustion via crafted HTTP request
Mattermost is vulnerable to CPU exhaustion via crafted HTTP request
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.
GHSA
Mattermost is vulnerable to CPU exhaustion via crafted HTTP request
ghsa·2026-01-16
CVE-2025-14822 [LOW] CWE-407 Mattermost is vulnerable to CPU exhaustion via crafted HTTP request
Mattermost is vulnerable to CPU exhaustion via crafted HTTP request
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.
No detection rules found.
No public exploits indexed.
2026-01-16
Published