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Go/github.com/mattermost/mattermost/server/v8 CVE-2026-3114: medium 6.5, EPSS 0.36%

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

Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260217110922-b7d4a1f1f59b or later.

go get github.com/mattermost/mattermost/server/v8@v11.4.1
go get github.com/mattermost/mattermost/server/v8@v11.3.2
go get github.com/mattermost/mattermost/server/v8@v11.2.4
go get github.com/mattermost/mattermost/server/v8@v10.11.12
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260217110922-b7d4a1f1f59b

Affected

introducedfixedlast affected
11.4.011.4.1-
11.3.011.3.2-
11.2.011.2.4-
10.11.010.11.12-
8.0.0-20260105080200-d27a2195068d8.0.0-20260217110922-b7d4a1f1f59b-

Fixed versions

11.4.111.3.211.2.410.11.128.0.0-20260217110922-b7d4a1f1f59b

Sources

CVE-2026-3114 · published · modified · JSON