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GHSA-9r42-rhw3-2222

Mattermost is vulnerable to CPU exhaustion via crafted HTTP request

Source: GitHub Advisory Database (reviewed) Low CVE-2025-14822

Packages

EcosystemPackageAffectedFixed in
Go github.com/mattermost/mattermost-server >= 10.11.0, < 10.11.9 10.11.9
Go github.com/mattermost/mattermost-server >= 11.0.0, < 11.2.0 11.2.0

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.