Description
Synapse is an open-source Matrix homeserver. Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality. Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| element-hq | synapse | < 1.120.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | matrix-synapse | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | matrix-synapse | No fix yet | — |
| Ubuntu Pro 20.04 LTS | matrix-synapse | No fix yet | — |
| Ubuntu Pro 18.04 LTS | matrix-synapse | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | matrix-synapse | 1.120.2-1.1 | openSUSE-SU-2024:14541-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | synapse | 1.120.2-r0 | — |
| Alpine v3.23 | synapse | 1.120.2-r0 | — |
| Alpine v3.22 | synapse | 1.120.2-r0 | — |
| Alpine v3.21 | synapse | 1.120.2-r0 | — |
| Alpine v3.20 | synapse | 1.120.1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | matrix-synapse | < 1.120.1 | 1.120.1 | GHSA-f3r3-h2mq-hx2h |
Advisories 1
- openSUSE-SU-2024:14541-1 matrix-synapse-1.120.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026