{"action":"Upgrade org.graylog2:graylog2-server to 6.3.12 (6.3.x), 7.0.7 (7.0.x) or 7.1.2 (7.1.x) or later.","affected":[{"fixed":"6.3.12","introduced":"0"},{"fixed":"7.0.7","introduced":"7.0.0"},{"fixed":"7.1.2","introduced":"7.1.0"}],"component":"org.graylog2:graylog2-server","cve_ids":["CVE-2026-55841"],"ecosystem":"Maven","epss":0.00633,"exploited":false,"fixed_versions":["6.3.12","7.0.7","7.1.2"],"ghsa_id":"GHSA-gqr6-r77p-c2pj","id":"tcs_01M5N8YST3MDECXZMQ398GW35P","modified_at":"2026-08-28T22:25:38.021373Z","published_at":"2026-08-28T22:13:00Z","references":["https://osv.dev/vulnerability/GHSA-gqr6-r77p-c2pj","https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-gqr6-r77p-c2pj","https://github.com/Graylog2/graylog2-server/pull/26050","https://github.com/Graylog2/graylog2-server/pull/26056","https://github.com/Graylog2/graylog2-server/pull/26057","https://github.com/Graylog2/graylog2-server/pull/26059","https://github.com/Graylog2/graylog2-server/commit/793df6e8202ea55c15a762e47a2a8a775961dd3f","https://github.com/Graylog2/graylog2-server/commit/85dc699d6319aea433583dc239077a3a799c8627","https://github.com/Graylog2/graylog2-server/commit/d5051e604c962ef3d4e5e8e434d0ff4907d2140d","https://github.com/Graylog2/graylog2-server/commit/dde76d7432c469887d9a95c208083c5f0f73c70d","https://github.com/Graylog2/graylog2-server"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-gqr6-r77p-c2pj","url":"https://osv.dev/vulnerability/GHSA-gqr6-r77p-c2pj"}],"summary":"Fortigate syslog message parser can be exploited to modify or delete fields from the original message"}