Description
Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| element-hq | synapse | >= 1.113.0rc1, < 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.
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 | >= 1.113.0rc1, < 1.120.1 | 1.120.1 | GHSA-56w4-5538-8v8h |
Advisories 1
- openSUSE-SU-2024:14541-1 matrix-synapse-1.120.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026