What is CVE-2020-26890?

CVE-2020-26890 is a high-severity vulnerability in Matrix Synapse, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-11-24.

How severe is CVE-2020-26890?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Matrix Synapse

CVE-2020-26890

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 Mat…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.030 (85.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Matrix Synapse
Fedoraproject Fedora — versions 32, 33
N/a — versions n/a

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_FEDORA, vendor-advisory)
cve@mitre.org (x_refsource_FEDORA, vendor-advisory)

Frequently asked questions

What is CVE-2020-26890?: CVE-2020-26890 is a high-severity vulnerability in Matrix Synapse, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-11-24.
How severe is CVE-2020-26890?: High severity. CVSS v3 base score is 7.5 out of 10.