Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed in Synapse v1.127.1. No known workarounds are available.
CVSS Details
- CVSS 3.1 Base Score: 7.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade synapse | Aug 8, 2025 | Mar 27, 2025 |
| Freebsd | — | Upgrade py310-matrix-synapseUpgrade py39-matrix-synapseUpgrade py311-matrix-synapseUpgrade py38-matrix-synapse | Apr 15, 2025 | Mar 26, 2025 |
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