Description
Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This vulnerability is fixed in 1.152.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| element-hq | synapse | < 1.152.1 | — |
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 | 1.153.0-2.1 | openSUSE-SU-2026:10898-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | synapse | 1.152.1-r0 | — |
| Alpine v3.23 | synapse | 1.152.1-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | matrix-synapse | < 1.152.1 | 1.152.1 | GHSA-6qf2-7x63-mm6v |
Advisories 1
- openSUSE-SU-2026:10898-1 matrix-synapse-1.153.0-2.1 on GA media SUSE / openSUSE Security Updates · May 30, 2026