Technology · PyPI
matrix-synapse (PyPI) vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 45 vulnerabilities in matrix-synapse (PyPI): 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-2019-11842, was published on 9 July 2026.
- Last 7 days
- 0
- Last 90 days
- 0
- Critical, all time
- 0
- Exploited in the wild
- 0
About matrix-synapse (PyPI)
Matrix protocol homeserver implementation written in Python.
Latest matrix-synapse (PyPI) vulnerabilities
- CVE-2019-11842: PYSEC-2026-2620 - matrix-sydent and matrix-synapse Use Cryptographically Weak PRNGlowCVSS 3EPSS 1.8%
- CVE-2025-30355: PYSEC-2026-1614 - Synapse vulnerable to federation denial of service via malformed eventslowCVSS 3.1EPSS 1.2%
- CVE-2024-53867: PYSEC-2026-1610 - Synapse Matrix has a partial room state leak via Sliding SynclowCVSS 3.1EPSS 0.4%
- CVE-2024-53863: Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decodersmediumCVSS 4EPSS 0.6%
- CVE-2024-52815: PYSEC-2026-1611 - Synapse allows a a malformed invite to break the invitee's `/sync`mediumCVSS 4EPSS 0.6%
- CVE-2024-52805: PYSEC-2026-1613 - Synapse allows unsupported content types to lead to memory exhaustionmediumCVSS 4EPSS 0.7%
- CVE-2018-10657: PYSEC-2026-846 - Matrix Synapse DoSlowCVSS 3EPSS 1.5%
- CVE-2018-16515: PYSEC-2026-845 - Matrix Synapse Improper Signature ValidationlowCVSS 3EPSS 1.5%
- CVE-2018-12423: PYSEC-2026-844 - Matrix Synapse Authorization ErrorlowCVSS 3EPSS 1.8%
- CVE-2018-12291: PYSEC-2026-664 - Matrix Synapse Security Filtering FlawlowCVSS 3EPSS 1.8%
- CVE-2022-41952: PYSEC-2026-663 - Uncontrolled Resource Consumption in Matrix SynapselowCVSS 3.1EPSS 0.9%
- 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-2025-61672: PYSEC-2026-1612 - Synapse's invalid device keys degrade federation functionalitymediumCVSS 4EPSS 0.5%
- CVE-2024-37303: Matrix Synapse unauthenticated media write in media repositorymediumCVSS 5.3EPSS 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-2023-43796: Synapse vulnerable to leak of remote user device informationlowCVSS 3.1EPSS 0.9%
- CVE-2023-45129: matrix-synapse vulnerable to denial of service due to malicious server ACL eventslowCVSS 3.1EPSS 1.2%
- CVE-2023-41335: matrix-synapse vulnerable to temporary storage of plaintext passwords during password changeslowCVSS 3.1EPSS 0.4%
- CVE-2023-42453: matrix-synapse vulnerable to improper validation of receipts allows forged read receiptslowCVSS 3.1EPSS 0.7%
- CVE-2023-32682: Matrix Synapse improper deactivated user checks during loginlowCVSS 3.1EPSS 0.8%
- CVE-2023-32683: Synapse has URL deny list bypass via oEmbed and image URLs when generating previewslowCVSS 3.1EPSS 0.6%
- CVE-2022-39335: Synapse does not apply enough checks to servers requesting auth events of events in a roomlowCVSS 3.1EPSS 0.6%
- CVE-2022-39374: Synapse Denial of service due to incorrect application of event authorization rules during state resolutionlowCVSS 3.1EPSS 0.9%
Most severe matrix-synapse (PyPI) 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-2024-37303: Matrix Synapse unauthenticated media write in media repositorymediumCVSS 5.3EPSS 0.4%
- CVE-2024-52805: PYSEC-2026-1613 - Synapse allows unsupported content types to lead to memory exhaustionmediumCVSS 4EPSS 0.7%
- CVE-2024-53863: Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decodersmediumCVSS 4EPSS 0.6%
- CVE-2024-52815: PYSEC-2026-1611 - Synapse allows a a malformed invite to break the invitee's `/sync`mediumCVSS 4EPSS 0.6%
- CVE-2025-61672: PYSEC-2026-1612 - Synapse's invalid device keys degrade federation functionalitymediumCVSS 4EPSS 0.5%
- CVE-2026-45076: Matrix Synapse denial of service in room history paginationmediumCVSS 4EPSS 0.4%
- CVE-2020-26890: Denial of service attack due to invalid JSONlowCVSS 3.1EPSS 3.0%
- CVE-2020-26257: Denial of service attack via incorrect parameters in Matrix SynapselowCVSS 3.1EPSS 2.4%
Vulnerabilities per week
Nothing was published in the last eight weeks. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 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 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many matrix-synapse (PyPI) vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/matrix-synapse)<a href="https://junglewise.ai/threats/technologies/matrix-synapse"><img src="https://junglewise.ai/threats/technologies/matrix-synapse/badge.svg" alt="matrix-synapse (PyPI) vulnerabilities" /></a>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/matrix-synapse.json, and this page as text at https://junglewise.ai/threats/technologies/matrix-synapse.md, 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, "matrix-synapse (PyPI) vulnerabilities", https://junglewise.ai/threats/technologies/matrix-synapse, 13 November 2026.