{"action":"Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20260115183946-38b413a27604 or later.","affected":[{"fixed":"5.3.2-0.20260115183946-38b413a27604","introduced":"0"},{"fixed":"10.11.11","introduced":"10.11.0-rc1"},{"fixed":"11.2.3","introduced":"11.2.0-rc1"},{"fixed":"11.3.1","introduced":"11.3.0-rc1"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-26246"],"ecosystem":"Go","epss":0.00225,"exploited":false,"fixed_versions":["5.3.2-0.20260115183946-38b413a27604","10.11.11","11.2.3","11.3.1"],"ghsa_id":"GHSA-44mv-jq72-gj49","id":"tcs_01M5KEVT18NCGEC2DC90GVWNE3","modified_at":"2026-04-27T14:19:12Z","published_at":"2026-03-16T15:30:42Z","references":["https://osv.dev/vulnerability/GHSA-44mv-jq72-gj49","https://nvd.nist.gov/vuln/detail/CVE-2026-26246","https://github.com/mattermost/mattermost/commit/38b413a27604e8721fbe008f8ec4b4e6c47ad4f0","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-44mv-jq72-gj49#Go/github.com/mattermost/mattermost-server","url":"https://osv.dev/vulnerability/GHSA-44mv-jq72-gj49"}],"summary":"Mattermost fails to bound memory allocation when processing PSD image files"}