{"action":"Upgrade matrix-synapse to 1.152.1 or later.","affected":[{"fixed":"1.152.1","introduced":"0"}],"component":"matrix-synapse","cve_ids":["CVE-2026-45076"],"ecosystem":"PyPI","epss":0.00369,"exploited":false,"fixed_versions":["1.152.1"],"ghsa_id":"GHSA-6qf2-7x63-mm6v","id":"tcs_01M5KGWJQSCH5TZ8PGFY643F4Q","modified_at":"2026-06-05T12:45:16.338802941Z","published_at":"2026-05-28T17:16:31.590Z","references":["https://osv.dev/vulnerability/PYSEC-2026-194","https://github.com/element-hq/synapse/security/advisories/GHSA-6qf2-7x63-mm6v"],"severity":{"label":"low","score":2.7},"sources":[{"source":"osv","source_id":"PYSEC-2026-194","url":"https://osv.dev/vulnerability/PYSEC-2026-194"}],"summary":"Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full hi"}