Synapse vulnerable to federation denial of service via malformed events
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| element-hq | synapse | affected |
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No data.
| Vendor | Product | Versions |
|---|---|---|
| Element-hq | Synapse | — |
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2025-8265 | Synapse vulnerable to federation denial of service via malformed events |
Github GHSA |
GHSA-v56r-hwv5-mxg6 | Synapse vulnerable to federation denial of service via malformed events |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: 1.2% (1.226% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Matrix
Matrix synapse |
|
| Weaknesses | NVD-CWE-noinfo | |
| CPEs | cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Matrix
Matrix synapse |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Synapse vulnerable to federation denial of service via malformed events | |
| Weaknesses | CWE-20 | |
| References |
| |
| Metrics |
cvssV3_1
|