{"action":"Upgrade matrix-synapse to 0.99.3.1 or later.","affected":[{"fixed":"0.99.3.1","introduced":"0"}],"component":"matrix-synapse","cve_ids":["CVE-2019-11842"],"ecosystem":"PyPI","epss":0.01795,"exploited":false,"fixed_versions":["0.99.3.1"],"ghsa_id":"GHSA-gwf7-vfjf-wf6x","id":"tcs_01M5KG8V3QJC2KK4TGNFAJ3MD2","modified_at":"2026-07-13T16:42:32.863521797Z","published_at":"2019-05-09T18:29:00Z","references":["https://osv.dev/vulnerability/PYSEC-2019-185","https://matrix.org/blog/2019/05/03/security-updates-sydent-1-0-3-synapse-0-99-3-1-and-riot-android-0-9-0-0-8-99-0-8-28-a/","https://github.com/advisories/GHSA-gwf7-vfjf-wf6x"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"PYSEC-2019-185","url":"https://osv.dev/vulnerability/PYSEC-2019-185"}],"summary":"An issue was discovered in Matrix Sydent before 1.0.3 and Synapse before 0.99.3.1. Random number generation is mishandled, which makes it easier for attackers to predict a Sydent authentication token"}