{"schema_version":"1.3.1","id":"GO-2026-5325","modified":"2026-06-25T18:43:19Z","published":"2026-06-25T18:43:19Z","aliases":["CVE-2026-6340","GHSA-cjm8-jxpw-g43m"],"summary":"Mattermost doesn't validate 7zip archive structure before processing in github.com/mattermost/mattermost-server","details":"Mattermost doesn't validate 7zip archive structure before processing in github.com/mattermost/mattermost-server.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: github.com/mattermost/mattermost-server/v5 before v5.3.2-0.20260325191733-fb11968f8798.","affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.11.0+incompatible"},{"fixed":"10.11.14+incompatible"},{"introduced":"11.4.0+incompatible"},{"fixed":"11.4.4+incompatible"},{"introduced":"11.5.0+incompatible"},{"fixed":"11.5.2+incompatible"}]}],"ecosystem_specific":{}},{"package":{"name":"github.com/mattermost/mattermost-server/v5","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"ecosystem_specific":{"custom_ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.2-0.20260325191733-fb11968f8798"}]}]}},{"package":{"name":"github.com/mattermost/mattermost-server/v6","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"ecosystem_specific":{}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.0.0-20260325191733-fb11968f8798"}]}],"ecosystem_specific":{}}],"references":[{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-cjm8-jxpw-g43m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6340"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/fb11968f8798925c7b75711025bc5f991124ba26"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-5325","review_status":"UNREVIEWED"}}