{"action":"Upgrade matrix-synapse to 1.152.1 or later.","affected":[{"fixed":"1.152.1","introduced":"0"}],"component":"matrix-synapse","cve_ids":["CVE-2026-45078"],"ecosystem":"PyPI","epss":0.00128,"exploited":false,"fixed_versions":["1.152.1"],"ghsa_id":"GHSA-8q93-326v-3m7g","id":"tcs_01M5KF8VAT1TX5VSV6DCAW1JXK","modified_at":"2026-09-10T03:51:04.962109818Z","published_at":"2026-05-14T16:18:40Z","references":["https://osv.dev/vulnerability/GHSA-8q93-326v-3m7g","https://github.com/element-hq/synapse/security/advisories/GHSA-8q93-326v-3m7g","https://nvd.nist.gov/vuln/detail/CVE-2026-45078","https://github.com/element-hq/synapse/issues/19394","https://github.com/element-hq/synapse/commit/3f58bc50dfba5768ee43ce48c5e74c25ba0b078a","https://github.com/element-hq/synapse","https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2026-191.yaml"],"severity":{"label":"medium","score":5.5},"sources":[{"source":"osv","source_id":"GHSA-8q93-326v-3m7g","url":"https://osv.dev/vulnerability/GHSA-8q93-326v-3m7g"}],"summary":"Synapse CPU starvation (Denial of Service)"}