# matrix-synapse (PyPI) vulnerabilities

Source: https://junglewise.ai/threats/technologies/matrix-synapse  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/matrix-synapse.json  
License: CC BY 4.0 with a link back

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.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 45 (0 critical, 0 exploited in the wild)

## 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 PRNG](https://junglewise.ai/threats/cve-2019-11842-matrix-sydent-and-matrix-synapse-use-cryptographically-weak-prng) (low, CVSS 3, published 9 Jul 2026)
- [CVE-2025-30355: PYSEC-2026-1614 - Synapse vulnerable to federation denial of service via malformed events](https://junglewise.ai/threats/cve-2025-30355-synapse-vulnerable-to-federation-denial-of-service-via-malformed) (low, CVSS 3.1, published 7 Jul 2026)
- [CVE-2024-53867: PYSEC-2026-1610 - Synapse Matrix has a partial room state leak via Sliding Sync](https://junglewise.ai/threats/cve-2024-53867-synapse-matrix-has-a-partial-room-state-leak-via-sliding-sync) (low, CVSS 3.1, published 7 Jul 2026)
- [CVE-2024-53863: Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders](https://junglewise.ai/threats/cve-2024-53863-synapse-can-be-forced-to-thumbnail-unexpected-file-formats) (medium, CVSS 4, published 7 Jul 2026)
- [CVE-2024-52815: PYSEC-2026-1611 - Synapse allows a a malformed invite to break the invitee's `/sync`](https://junglewise.ai/threats/cve-2024-52815-synapse-allows-a-a-malformed-invite-to-break-the-invitee-s-sync) (medium, CVSS 4, published 7 Jul 2026)
- [CVE-2024-52805: PYSEC-2026-1613 - Synapse allows unsupported content types to lead to memory exhaustion](https://junglewise.ai/threats/cve-2024-52805-synapse-allows-unsupported-content-types-to-lead-to-memory) (medium, CVSS 4, published 7 Jul 2026)
- [CVE-2018-10657: PYSEC-2026-846 - Matrix Synapse DoS](https://junglewise.ai/threats/cve-2018-10657-matrix-synapse-dos) (low, CVSS 3, published 6 Jul 2026)
- [CVE-2018-16515: PYSEC-2026-845 - Matrix Synapse Improper Signature Validation](https://junglewise.ai/threats/cve-2018-16515-matrix-synapse-improper-signature-validation) (low, CVSS 3, published 6 Jul 2026)
- [CVE-2018-12423: PYSEC-2026-844 - Matrix Synapse Authorization Error](https://junglewise.ai/threats/cve-2018-12423-matrix-synapse-authorization-error) (low, CVSS 3, published 6 Jul 2026)
- [CVE-2018-12291: PYSEC-2026-664 - Matrix Synapse Security Filtering Flaw](https://junglewise.ai/threats/cve-2018-12291-matrix-synapse-security-filtering-flaw) (low, CVSS 3, published 2 Jul 2026)
- [CVE-2022-41952: PYSEC-2026-663 - Uncontrolled Resource Consumption in Matrix Synapse](https://junglewise.ai/threats/cve-2022-41952-uncontrolled-resource-consumption-in-matrix-synapse) (low, CVSS 3.1, published 2 Jul 2026)
- [CVE-2026-45078: Element Synapse CPU starvation denial of service](https://junglewise.ai/threats/cve-2026-45078-element-synapse-cpu-starvation-denial-of-service) (medium, CVSS 5.5, published 28 May 2026)
- [CVE-2026-45076: Matrix Synapse denial of service in room history pagination](https://junglewise.ai/threats/cve-2026-45076-matrix-synapse-denial-of-service-in-room-history-pagination) (medium, CVSS 4, published 28 May 2026)
- [CVE-2025-61672: PYSEC-2026-1612 - Synapse's invalid device keys degrade federation functionality](https://junglewise.ai/threats/cve-2025-61672-synapse-s-invalid-device-keys-degrade-federation-functionality) (medium, CVSS 4, published 8 Oct 2025)
- [CVE-2024-37303: Matrix Synapse unauthenticated media write in media repository](https://junglewise.ai/threats/cve-2024-37303-matrix-synapse-unauthenticated-media-write-in-media-repository) (medium, CVSS 5.3, published 3 Dec 2024)
- [CVE-2024-37302: Element Synapse denial of service via media disk space consumption](https://junglewise.ai/threats/cve-2024-37302-element-synapse-denial-of-service-via-media-disk-space) (high, CVSS 7.5, published 3 Dec 2024)
- [CVE-2024-31208: PYSEC-2024-50 - Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room…](https://junglewise.ai/threats/cve-2024-31208-element-synapse-denial-of-service-via-auth-chain-indexing) (low, CVSS 3.1, published 23 Apr 2024)
- [CVE-2023-43796: Synapse vulnerable to leak of remote user device information](https://junglewise.ai/threats/cve-2023-43796-synapse-vulnerable-to-leak-of-remote-user-device-information) (low, CVSS 3.1, published 31 Oct 2023)
- [CVE-2023-45129: matrix-synapse vulnerable to denial of service due to malicious server ACL events](https://junglewise.ai/threats/cve-2023-45129-matrix-synapse-vulnerable-to-denial-of-service-due-to-malicious) (low, CVSS 3.1, published 10 Oct 2023)
- [CVE-2023-41335: matrix-synapse vulnerable to temporary storage of plaintext passwords during password changes](https://junglewise.ai/threats/cve-2023-41335-matrix-synapse-vulnerable-to-temporary-storage-of-plaintext) (low, CVSS 3.1, published 27 Sep 2023)
- [CVE-2023-42453: matrix-synapse vulnerable to improper validation of receipts allows forged read receipts](https://junglewise.ai/threats/cve-2023-42453-matrix-synapse-vulnerable-to-improper-validation-of-receipts) (low, CVSS 3.1, published 27 Sep 2023)
- [CVE-2023-32682: Matrix Synapse improper deactivated user checks during login](https://junglewise.ai/threats/cve-2023-32682-matrix-synapse-improper-deactivated-user-checks-during-login) (low, CVSS 3.1, published 6 Jun 2023)
- [CVE-2023-32683: Synapse has URL deny list bypass via oEmbed and image URLs when generating previews](https://junglewise.ai/threats/cve-2023-32683-synapse-has-url-deny-list-bypass-via-oembed-and-image-urls-when) (low, CVSS 3.1, published 6 Jun 2023)
- [CVE-2022-39335: Synapse does not apply enough checks to servers requesting auth events of events in a room](https://junglewise.ai/threats/cve-2022-39335-synapse-does-not-apply-enough-checks-to-servers-requesting-auth) (low, CVSS 3.1, published 26 May 2023)
- [CVE-2022-39374: Synapse Denial of service due to incorrect application of event authorization rules during state resolution](https://junglewise.ai/threats/cve-2022-39374-synapse-denial-of-service-due-to-incorrect-application-of-event) (low, CVSS 3.1, published 26 May 2023)

## Most severe matrix-synapse (PyPI) vulnerabilities

- [CVE-2024-37302: Element Synapse denial of service via media disk space consumption](https://junglewise.ai/threats/cve-2024-37302-element-synapse-denial-of-service-via-media-disk-space) (high, CVSS 7.5, published 3 Dec 2024)
- [CVE-2026-45078: Element Synapse CPU starvation denial of service](https://junglewise.ai/threats/cve-2026-45078-element-synapse-cpu-starvation-denial-of-service) (medium, CVSS 5.5, published 28 May 2026)
- [CVE-2024-37303: Matrix Synapse unauthenticated media write in media repository](https://junglewise.ai/threats/cve-2024-37303-matrix-synapse-unauthenticated-media-write-in-media-repository) (medium, CVSS 5.3, published 3 Dec 2024)
- [CVE-2024-52805: PYSEC-2026-1613 - Synapse allows unsupported content types to lead to memory exhaustion](https://junglewise.ai/threats/cve-2024-52805-synapse-allows-unsupported-content-types-to-lead-to-memory) (medium, CVSS 4, published 7 Jul 2026)
- [CVE-2024-53863: Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders](https://junglewise.ai/threats/cve-2024-53863-synapse-can-be-forced-to-thumbnail-unexpected-file-formats) (medium, CVSS 4, published 7 Jul 2026)
- [CVE-2024-52815: PYSEC-2026-1611 - Synapse allows a a malformed invite to break the invitee's `/sync`](https://junglewise.ai/threats/cve-2024-52815-synapse-allows-a-a-malformed-invite-to-break-the-invitee-s-sync) (medium, CVSS 4, published 7 Jul 2026)
- [CVE-2025-61672: PYSEC-2026-1612 - Synapse's invalid device keys degrade federation functionality](https://junglewise.ai/threats/cve-2025-61672-synapse-s-invalid-device-keys-degrade-federation-functionality) (medium, CVSS 4, published 8 Oct 2025)
- [CVE-2026-45076: Matrix Synapse denial of service in room history pagination](https://junglewise.ai/threats/cve-2026-45076-matrix-synapse-denial-of-service-in-room-history-pagination) (medium, CVSS 4, published 28 May 2026)
- [CVE-2020-26890: Denial of service attack due to invalid JSON](https://junglewise.ai/threats/cve-2020-26890-denial-of-service-attack-due-to-invalid-json) (low, CVSS 3.1, published 24 Nov 2020)
- [CVE-2020-26257: Denial of service attack via incorrect parameters in Matrix Synapse](https://junglewise.ai/threats/cve-2020-26257-denial-of-service-attack-via-incorrect-parameters-in-matrix) (low, CVSS 3.1, published 9 Dec 2020)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other PyPI technologies

- [tensorflow (PyPI)](https://junglewise.ai/threats/technologies/pypi-tensorflow): 435 vulnerabilities
- [tensorflow-cpu (PyPI)](https://junglewise.ai/threats/technologies/tensorflow-cpu): 430 vulnerabilities
- [tensorflow-gpu (PyPI)](https://junglewise.ai/threats/technologies/tensorflow-gpu): 427 vulnerabilities
- [open-webui (PyPI)](https://junglewise.ai/threats/technologies/open-webui): 177 vulnerabilities
- [Django (PyPI)](https://junglewise.ai/threats/technologies/django): 173 vulnerabilities
- [apache-airflow (PyPI)](https://junglewise.ai/threats/technologies/apache-airflow): 159 vulnerabilities
- [pillow (PyPI)](https://junglewise.ai/threats/technologies/pillow): 125 vulnerabilities
- [praisonai (PyPI)](https://junglewise.ai/threats/technologies/pypi-praisonai): 120 vulnerabilities
- [vllm (PyPI)](https://junglewise.ai/threats/technologies/pypi-vllm): 117 vulnerabilities
- [plone (PyPI)](https://junglewise.ai/threats/technologies/pypi-plone): 101 vulnerabilities
- [mlflow (PyPI)](https://junglewise.ai/threats/technologies/mlflow): 88 vulnerabilities
- [picklescan (PyPI)](https://junglewise.ai/threats/technologies/picklescan): 86 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "matrix-synapse (PyPI) vulnerabilities", https://junglewise.ai/threats/technologies/matrix-synapse, 13 November 2026.