Go/github.com/mattermost/mattermost/server/v8 CVE-2026-6340: unknown, EPSS 0.24%

Mattermost doesn't validate 7zip archive structure before processing in github.com/mattermost/mattermost-server

Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260325191733-fb11968f8798 or later.

go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260325191733-fb11968f8798

Affected

Fixed versions

Sources

• osv: GO-2026-5325#Go/github.com/mattermost/mattermost/server/v8
• https://github.com/advisories/GHSA-cjm8-jxpw-g43m
• https://nvd.nist.gov/vuln/detail/CVE-2026-6340
• https://github.com/mattermost/mattermost/commit/fb11968f8798925c7b75711025bc5f991124ba26
• https://mattermost.com/security-updates

CVE-2026-6340 · published 2026-06-25T18:43:19Z · modified 2026-06-25T19:45:28.843452652Z · JSON