{"action":"Upgrade matrix-synapse to 0.28.1 or later.","affected":[{"fixed":"0.28.1","introduced":"0"}],"component":"matrix-synapse","cve_ids":["CVE-2018-10657"],"ecosystem":"PyPI","epss":0.01494,"exploited":false,"fixed_versions":["0.28.1"],"ghsa_id":"GHSA-vmcc-4p4x-x7wg","id":"tcs_01M5KHDXPNH2BNHTJ77ARV0MK1","modified_at":"2026-07-07T11:46:05.957211927Z","published_at":"2026-07-06T08:03:24.087354Z","references":["https://osv.dev/vulnerability/PYSEC-2026-846","https://nvd.nist.gov/vuln/detail/CVE-2018-10657","https://github.com/matrix-org/synapse/commit/33f469ba19586bbafa0cf2c7d7c35463bdab87eb","https://docs.google.com/document/d/1I3fi2S-XnpO45qrpCsowZv8P8dHcNZ4fsBsbOW7KABI/edit#heading=h.fj95ykuss7s1","https://github.com/matrix-org/synapse","https://matrix.org/blog/2018/05/01/security-update-synapse-0-28-1","https://pypi.org/project/matrix-synapse","https://github.com/advisories/GHSA-vmcc-4p4x-x7wg"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2026-846","url":"https://osv.dev/vulnerability/PYSEC-2026-846"}],"summary":"Matrix Synapse DoS"}