{"id":"CVE-2019-11842","aliases":["GHSA-gwf7-vfjf-wf6x","PYSEC-2019-185","PYSEC-2026-2620"],"url":"https://o3.security/vulnerability/CVE-2019-11842","summary":"matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG","details":"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 or a Synapse random ID.","published":"2019-05-09T18:29:07.197Z","modified":"2026-07-13T16:42:32.863521797Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"matrix-sydent","fixedVersion":"1.0.3"},{"ecosystem":"PyPI","name":"matrix-synapse","fixedVersion":"0.99.3.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"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/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-13T16:42:32.863521797Z"}}