{"cve":"CVE-2019-11842","nvd":{"published":"2019-05-09T18:29:07.197","modified":"2026-06-17T02:13:43.693","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-338"],"references":["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://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/"],"products":["matrix:sydent","matrix:synapse"],"source":"nvd","synced_at":"2026-10-19T20:56:19.218283075+00:00"},"epss":{"cve":"CVE-2019-11842","score":0.01795,"percentile":0.78429,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gwf7-vfjf-wf6x","url":"https://osv.dev/vulnerability/GHSA-gwf7-vfjf-wf6x","summary":"matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG","modified":"2026-07-13T16:42:32.863521797Z","packages":[{"ecosystem":"PyPI","name":"matrix-sydent","purl":"pkg:pypi/matrix-sydent","ranges":["<1.0.3"],"fixed":["1.0.3"]},{"ecosystem":"PyPI","name":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","ranges":["<0.99.3.1"],"fixed":["0.99.3.1"]}]},{"id":"PYSEC-2019-185","url":"https://osv.dev/vulnerability/PYSEC-2019-185","summary":"","modified":"2026-07-13T16:42:32.863521797Z","packages":[{"ecosystem":"PyPI","name":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","ranges":["<0.99.3.1"],"fixed":["0.99.3.1"]}]},{"id":"PYSEC-2026-2620","url":"https://osv.dev/vulnerability/PYSEC-2026-2620","summary":"matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG","modified":"2026-07-13T16:42:32.863521797Z","packages":[{"ecosystem":"PyPI","name":"matrix-sydent","purl":"pkg:pypi/matrix-sydent","ranges":["<1.0.3"],"fixed":["1.0.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}