https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-19T02:14:11.053294+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-22225 EUVD-2026-22225 2026-10-19T02:14:11.057082+00:00 EUVD-2026-22225 https://cve.radiocsirt.org/vuln/fkie_cve-2021-21394 fkie_cve-2021-21394 2026-10-19T02:14:11.057116+00:00

Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 Synapse is missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. Refer to referenced GitHub security advisory for additional details including workarounds.

 https://cve.radiocsirt.org/vuln/ghsa-w9fg-xffh-p362 GHSA-w9fg-xffh-p362 — Denial of service (via resource exhaustion) due to improper input validation on third-party identifier endpoints 2026-10-19T02:14:11.057151+00:00

Affected: PyPI: matrix-synapse

### Impact Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion.

### Patches The issue is fixed by #9321.

### Workarounds Depending on the needs and configuration of the homeserver a few options are available:

1. Using email as third-party identifiers be disabled by not configuring the `email` setting. 2. Using phone numbers as third-party identifiers can be disabled by ensuring that `account_threepid_delegates.msisdn` is not configured. 3. Additionally, the affected endpoint patterns can be blocked at a reverse proxy:

* `^/_matrix/client/(r0|unstable)/register/email` * `^/_matrix/client/(r0|unstable)/register/msisdn` * `^/_matrix/client/(r0|unstable)/account/password` * `^/_matrix/client/(r0|unstable)/account/3pid`

 https://cve.radiocsirt.org/vuln/gsd-2021-21394 gsd-2021-21394 2026-10-19T02:14:11.057183+00:00 gsd-2021-21394 https://cve.radiocsirt.org/vuln/pysec-2021-27 PYSEC-2021-27 2026-10-19T02:14:11.057196+00:00

Affected: PyPI: matrix-synapse

Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 Synapse is missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. Refer to referenced GitHub security advisory for additional details including workarounds.

 https://cve.radiocsirt.org/vuln/ubuntu-cve-2021-21394 UBUNTU-CVE-2021-21394 2026-10-19T02:14:11.057216+00:00

Affected: Ubuntu:Pro:18.04:LTS: matrix-synapse, Ubuntu:Pro:20.04:LTS: matrix-synapse, Ubuntu:Pro:22.04:LTS: matrix-synapse

Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 Synapse is missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. Refer to referenced GitHub security advisory for additional details including workarounds.