{"schema_version":1,"title":"Element Synapse vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 6 vulnerabilities in Element Synapse: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-45078, was published on 28 May 2026.","url":"https://junglewise.ai/threats/technologies/synapse","json_url":"https://junglewise.ai/threats/technologies/synapse.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/synapse","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":1,"all_time":6,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":0,"last_365_days":2},"latest":[{"cve":"CVE-2026-45078","cvss":5.5,"epss":0.0013,"slug":"cve-2026-45078-element-synapse-cpu-starvation-denial-of-service","title":"Element Synapse CPU starvation denial of service","severity":"medium","exploited":false,"published_at":"2026-05-28T17:16:31.75+00:00","url":"https://junglewise.ai/threats/cve-2026-45078-element-synapse-cpu-starvation-denial-of-service"},{"cve":"CVE-2026-45076","cvss":4,"epss":0.0039,"slug":"cve-2026-45076-matrix-synapse-denial-of-service-in-room-history-pagination","title":"Matrix Synapse denial of service in room history pagination","severity":"medium","exploited":false,"published_at":"2026-05-28T17:16:31.59+00:00","url":"https://junglewise.ai/threats/cve-2026-45076-matrix-synapse-denial-of-service-in-room-history-pagination"},{"cve":"CVE-2024-37302","cvss":7.5,"epss":0.006,"slug":"cve-2024-37302-element-synapse-denial-of-service-via-media-disk-space","title":"Element Synapse denial of service via media disk space consumption","severity":"high","exploited":false,"published_at":"2024-12-03T18:39:12+00:00","url":"https://junglewise.ai/threats/cve-2024-37302-element-synapse-denial-of-service-via-media-disk-space"},{"cve":"CVE-2024-31208","cvss":3.1,"epss":0.0146,"slug":"cve-2024-31208-element-synapse-denial-of-service-via-auth-chain-indexing","title":"PYSEC-2024-50 - Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.","severity":"low","exploited":false,"published_at":"2024-04-23T18:15:00+00:00","url":"https://junglewise.ai/threats/cve-2024-31208-element-synapse-denial-of-service-via-auth-chain-indexing"},{"cve":"CVE-2022-31052","cvss":3.1,"epss":0.0166,"slug":"cve-2022-31052-matrix-synapse-unbounded-recursion-in-url-preview-handling","title":"PYSEC-2022-224 - Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages","severity":"low","exploited":false,"published_at":"2022-06-28T17:15:00+00:00","url":"https://junglewise.ai/threats/cve-2022-31052-matrix-synapse-unbounded-recursion-in-url-preview-handling"},{"cve":"CVE-2021-21274","cvss":3.1,"epss":0.0216,"slug":"cve-2021-21274-matrix-synapse-denial-of-service-via-well-known-redirect","title":"PYSEC-2021-132 - Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant","severity":"low","exploited":false,"published_at":"2021-02-26T18:15:00+00:00","url":"https://junglewise.ai/threats/cve-2021-21274-matrix-synapse-denial-of-service-via-well-known-redirect"}],"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0}],"related":[],"technology":{"hub":true,"name":"Element Synapse","slug":"synapse","vendor":{"name":"Element","slug":"element","url":"https://junglewise.ai/threats/vendors/element"},"aliases":[],"category":"web-server","homepage":"https://element.io/matrix-services/synapse","repo_url":"https://github.com/element-hq/synapse","description":"Synapse is a reference implementation of a Matrix homeserver written in Python.","url":"https://junglewise.ai/threats/technologies/synapse"},"most_severe":[{"cve":"CVE-2024-37302","cvss":7.5,"epss":0.006,"slug":"cve-2024-37302-element-synapse-denial-of-service-via-media-disk-space","title":"Element Synapse denial of service via media disk space consumption","severity":"high","exploited":false,"published_at":"2024-12-03T18:39:12+00:00","url":"https://junglewise.ai/threats/cve-2024-37302-element-synapse-denial-of-service-via-media-disk-space"},{"cve":"CVE-2026-45078","cvss":5.5,"epss":0.0013,"slug":"cve-2026-45078-element-synapse-cpu-starvation-denial-of-service","title":"Element Synapse CPU starvation denial of service","severity":"medium","exploited":false,"published_at":"2026-05-28T17:16:31.75+00:00","url":"https://junglewise.ai/threats/cve-2026-45078-element-synapse-cpu-starvation-denial-of-service"},{"cve":"CVE-2026-45076","cvss":4,"epss":0.0039,"slug":"cve-2026-45076-matrix-synapse-denial-of-service-in-room-history-pagination","title":"Matrix Synapse denial of service in room history pagination","severity":"medium","exploited":false,"published_at":"2026-05-28T17:16:31.59+00:00","url":"https://junglewise.ai/threats/cve-2026-45076-matrix-synapse-denial-of-service-in-room-history-pagination"},{"cve":"CVE-2021-21274","cvss":3.1,"epss":0.0216,"slug":"cve-2021-21274-matrix-synapse-denial-of-service-via-well-known-redirect","title":"PYSEC-2021-132 - Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant","severity":"low","exploited":false,"published_at":"2021-02-26T18:15:00+00:00","url":"https://junglewise.ai/threats/cve-2021-21274-matrix-synapse-denial-of-service-via-well-known-redirect"},{"cve":"CVE-2022-31052","cvss":3.1,"epss":0.0166,"slug":"cve-2022-31052-matrix-synapse-unbounded-recursion-in-url-preview-handling","title":"PYSEC-2022-224 - Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages","severity":"low","exploited":false,"published_at":"2022-06-28T17:15:00+00:00","url":"https://junglewise.ai/threats/cve-2022-31052-matrix-synapse-unbounded-recursion-in-url-preview-handling"},{"cve":"CVE-2024-31208","cvss":3.1,"epss":0.0146,"slug":"cve-2024-31208-element-synapse-denial-of-service-via-auth-chain-indexing","title":"PYSEC-2024-50 - Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.","severity":"low","exploited":false,"published_at":"2024-04-23T18:15:00+00:00","url":"https://junglewise.ai/threats/cve-2024-31208-element-synapse-denial-of-service-via-auth-chain-indexing"}],"generated_at":"2026-09-26T13:07:00.120236+00:00"}