VDB
CVE-2020-26890
CVE-2020-26890
PUBLISHED
CVSS 7.5 HIGH
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.
EPSS 3.00% · 86.5th percentile
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
3.00%
86.5th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:20.04:LTS | matrix-synapse | 0, 1.4.0-1, 1.5.1-1 |
| Ubuntu:Pro:18.04:LTS | matrix-synapse | 0, 0.19.2+dfsg-6, 0.24.0+dfsg-1ubuntu0.1~esm1 |
Timeline
- Nov 24, 2020 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Dec 28, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 28, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 2, 2022 EPSS Score
- Sep 5, 2022 EPSS Score
- Nov 7, 2022 EPSS Score
- Jan 9, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2020-26890 third-party-advisory
- https://github.com/matrix-org/synapse/security/advisories/GHSA-4mp3-385r-v63f third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2020-26890 third-party-advisory