PyPI/matrix-synapse CVE-2020-26890: high 7.5, EPSS 3.00%

Denial of service attack due to invalid JSON

Action: Upgrade matrix-synapse to 1.20.0 or later.

pip install matrix-synapse==1.20.0

Affected

Fixed versions

Sources

• osv: GHSA-4mp3-385r-v63f
• https://github.com/matrix-org/synapse/security/advisories/GHSA-4mp3-385r-v63f
• https://nvd.nist.gov/vuln/detail/CVE-2020-26890
• https://github.com/matrix-org/synapse
• https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2020-237.yaml
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G7YXMMYQP46PYL664JQUXCA3LPBJU7DQ
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U34DPP4ZLOEDUY2ZCWOHQPU5GA5LYNUQ
• https://pypi.org/project/matrix-synapse

CVE-2020-26890 · published 2020-11-24T22:58:58Z · modified 2026-07-08T06:29:37.300767735Z · JSON