| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0+incompatible, < 10.11.14+incompatible≥ 11.4.0+incompatible, < 11.4.4+incompatible≥ 11.5.0+incompatible, < 11.5.2+incompatible< 5.3.2-0.20260325191733-fb11968f8798 | 10.11.14+incompatible11.4.4+incompatible11.5.2+incompatible5.3.2-0.20260325191733-fb11968f8798 |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | ≥ 10.11.0, < 10.11.14≥ 11.4.0, < 11.4.4≥ 11.5.0, < 11.5.2< 8.0.0-20260325191733-fb11968f8798 | 10.11.1411.4.411.5.28.0.0-20260325191733-fb11968f8798 |
| mattermost server | ≥ 10.11.0, < 10.11.14≥ 11.4.0, < 11.4.4≥ 11.5.0, < 11.5.2 | 10.11.1411.4.411.5.2 |
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
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