CVE-2020-26890: Denial of service attack due to invalid JSON
(updated )
A denial of service attack against Matrix clients can be exploited by sending an event including invalid JSON data to Synapse. Synapse would relay the data to clients which could crash or hang. Impact is long-lasting if the event is made part of the room state.
References
- github.com/advisories/GHSA-4mp3-385r-v63f
- github.com/matrix-org/synapse
- github.com/matrix-org/synapse/security/advisories/GHSA-4mp3-385r-v63f
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2020-237.yaml
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G7YXMMYQP46PYL664JQUXCA3LPBJU7DQ
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U34DPP4ZLOEDUY2ZCWOHQPU5GA5LYNUQ
- nvd.nist.gov/vuln/detail/CVE-2020-26890
- pypi.org/project/matrix-synapse
Code Behaviors & Features
Detect and mitigate CVE-2020-26890 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →