Technology · Element
Element Synapse vulnerabilities
Updated . Rebuilt every hour.
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.
- Last 7 days
- 0
- Last 90 days
- 0
- Critical, all time
- 0
- Exploited in the wild
- 0
About Element Synapse
Synapse is a reference implementation of a Matrix homeserver written in Python.
Latest Element Synapse vulnerabilities
- CVE-2026-45078: Element Synapse CPU starvation denial of servicemediumCVSS 5.5EPSS 0.1%
- CVE-2026-45076: Matrix Synapse denial of service in room history paginationmediumCVSS 4EPSS 0.4%
- CVE-2024-37302: Element Synapse denial of service via media disk space consumptionhighCVSS 7.5EPSS 0.6%
- CVE-2024-31208: PYSEC-2024-50 - Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room…lowCVSS 3.1EPSS 1.5%
- CVE-2022-31052: PYSEC-2022-224 - Synapse is an open source home server implementation for the Matrix chat network. In versions prior to…lowCVSS 3.1EPSS 1.7%
- CVE-2021-21274: PYSEC-2021-132 - Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an…lowCVSS 3.1EPSS 2.2%
Most severe Element Synapse vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2024-37302: Element Synapse denial of service via media disk space consumptionhighCVSS 7.5EPSS 0.6%
- CVE-2026-45078: Element Synapse CPU starvation denial of servicemediumCVSS 5.5EPSS 0.1%
- CVE-2026-45076: Matrix Synapse denial of service in room history paginationmediumCVSS 4EPSS 0.4%
- CVE-2021-21274: PYSEC-2021-132 - Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an…lowCVSS 3.1EPSS 2.2%
- CVE-2022-31052: PYSEC-2022-224 - Synapse is an open source home server implementation for the Matrix chat network. In versions prior to…lowCVSS 3.1EPSS 1.7%
- CVE-2024-31208: PYSEC-2024-50 - Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room…lowCVSS 3.1EPSS 1.5%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/synapse.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Element Synapse vulnerabilities", https://junglewise.ai/threats/technologies/synapse, 26 September 2026.