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CVE-2020-26890 is a high severity vulnerability with a CVSS score of 7.5. No known exploits currently, and patches are available.
Lower probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
A denial of service attack against Matrix clients can be exploited by sending an event including invalid JSON data to Synapse. Synapse would relay the data to clients which could crash or hang. Impact is long-lasting if the event is made part of the room state.
At a minimum #8106 and #8291 must be applied. #7372 and #8124 include additional checks.
There are no known workarounds.
If an invalid event is accepted by an earlier Synapse it can become part of the room state and will not be fixed by upgrading Synapse. Redacting the invalid event should avoid clients receiving the invalid event.
| Vendor | Product |
|---|---|
| Matrix | Synapse |
| Fedoraproject |
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| Fedora |