https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-25T12:30:01.018653+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-22194 EUVD-2026-22194 2026-10-25T12:30:01.022255+00:00 EUVD-2026-22194 https://cve.radiocsirt.org/vuln/fkie_cve-2021-21393 fkie_cve-2021-21393 2026-10-25T12:30:01.022291+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-jrh7-mhhx-6h88 GHSA-jrh7-mhhx-6h88 — Denial of service (via resource exhaustion) due to improper input validation on groups/communities endpoints 2026-10-25T12:30:01.022341+00:00

Affected: PyPI: matrix-synapse

### Impact Missing input validation of some parameters on the groups (also known as communities) endpoints could cause excessive use of disk space and memory leading to resource exhaustion. Additionally clients may have issues rendering large fields.

### Patches This issue is fixed by #9321 and #9393.

### Workarounds The groups feature can be disabled (by setting `enable_group_creation` to `False`) to mitigate this issue. Note that it is disabled by default.

### Other information Note that the groups feature is not part of the [Matrix specification](https://matrix.org/docs/spec/) and the chosen maximum lengths are arbitrary. Not all clients might abide by them.

 https://cve.radiocsirt.org/vuln/gsd-2021-21393 gsd-2021-21393 2026-10-25T12:30:01.022392+00:00 gsd-2021-21393 https://cve.radiocsirt.org/vuln/pysec-2021-26 PYSEC-2021-26 2026-10-25T12:30:01.022411+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-2021-21393 UBUNTU-CVE-2021-21393 2026-10-25T12:30:01.022451+00:00

Affected: 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.