GHSA-vhgh-g7x8-4rx8MediumCVSS 6.5

Mattermost doesn't validate decompressed archive entry sizes during file extraction

Published
March 26, 2026
Last Modified
March 31, 2026

🔗 CVE IDs covered (1)

CVE-2026-3114 →

📋 Description

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.

🎯 Affected products5

  • go/github.com/mattermost/mattermost/server/v8:= 11.4.0
  • go/github.com/mattermost/mattermost/server/v8:>= 11.3.0, < 11.3.2
  • go/github.com/mattermost/mattermost/server/v8:>= 11.2.0, < 11.2.4
  • go/github.com/mattermost/mattermost/server/v8:>= 10.11.0, < 10.11.12
  • go/github.com/mattermost/mattermost/server/v8:>= 8.0.0-20260105080200-d27a2195068d, < 8.0.0-20260217110922-b7d4a1f1f59b

🔗 References (3)