Matrix Synapse before 1.20.0 erroneously permits non-standard NaN, Infinity, and -Infinity JSON values in fields of m.room.member events, allowing remote attackers to execute a denial of service attack against the federation and common Matrix clients. If such a malformed event is accepted into the room's state, the impact is long-lasting and is not fixed by an upgrade to a newer version, requiring the event to be manually redacted instead. Since events are replicated to servers of other room members, the impact is not constrained to the server of the event sender.
History

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cve-icon MITRE Information

Status: PUBLISHED

Assigner: mitre

Published: 2020-11-24T02:07:06

Updated: 2020-12-10T02:06:07

Reserved: 2020-10-08T00:00:00


Link: CVE-2020-26890

JSON object: View

cve-icon NVD Information

Status : Modified

Published: 2020-11-24T03:15:13.120

Modified: 2023-11-07T03:20:45.937


Link: CVE-2020-26890

JSON object: View

cve-icon Redhat Information

No data.

CWE