GHSA-cjm8-jxpw-g43m
Mattermost doesn't validate 7zip archive structure before processing
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.5.0, < 11.5.2 | 11.5.2 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.11.0, < 10.11.14 | 10.11.14 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.4.0, < 11.4.4 | 11.4.4 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260325191733-fb11968f8798 | 8.0.0-20260325191733-fb11968f8798 |
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20260325191733-fb11968f8798 | 5.3.2-0.20260325191733-fb11968f8798 |
Details
As written in the advisory (Markdown source, shown as plain text).
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate 7zip archive structure before processing which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted 7zip file with excessive folder declarations.. Mattermost Advisory ID: MMSA-2026-00573
References
External links from the advisory. They lead to third-party sites.