GHSA-vhgh-g7x8-4rx8
Mattermost doesn't validate decompressed archive entry sizes during file extraction
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.4.0, < 11.4.1 | 11.4.1 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.3.0, < 11.3.2 | 11.3.2 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.2.0, < 11.2.4 | 11.2.4 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.11.0, < 10.11.12 | 10.11.12 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 8.0.0-20260105080200-d27a2195068d, < 8.0.0-20260217110922-b7d4a1f1f59b | 8.0.0-20260217110922-b7d4a1f1f59b |
Details
As written in the advisory (Markdown source, shown as plain text).
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate decompressed archive entry sizes during file extraction which allows authenticated users with file upload permissions to cause a denial of service via crafted zip archives containing highly compressed entries (zip bombs) that exhaust server memory. Mattermost Advisory ID: MMSA-2026-00598.
References
External links from the advisory. They lead to third-party sites.