CVE-2020-26890 is a denial-of-service vulnerability affecting Matrix Synapse versions prior to 1.20.0, as well as related Fedora products. It arises from Synapse's improper handling of non-standard JSON values (NaN, Infinity, -Infinity) in m.room.member events. This vulnerability carries a CVSS score of 7.5 (High), indicating it can be exploited remotely with low attack complexity, leading to a complete denial of service. The impact is persistent, affecting both federation and Matrix clients, and requires manual event redaction to remediate. There is currently no evidence of active exploitation, nor are there known public exploits or Metasploit modules available. Community discussion and media coverage for this CVE are minimal.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.20.0CPE matchmatch criteria | cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* | ||
32CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | ||
33CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.