CVE-2022-3786: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 92.5% chance of exploitation in the next 30 days.

A buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. Note that this occurs after certificate chain signature verification and requires either a CA to have signed a malicious certificate or for an application to continue certificate verification despite failure to construct a path to a trusted issuer. An attacker can craft a malicious email address in a certificate to overflow an arbitrary number of bytes containing the `.' character (decimal 46) on the stack. This buffer overflow could result in a crash (causing a denial of service). In a TLS client, this can be triggered by connecting to a malicious server. In a TLS server, this can be triggered if the server requests client authentication and a malicious client connects.

Affected products

• Fedoraproject Fedora: version 36 only; version 37 only
• Node.js Node.js: from 18.0.0, before 18.11.0 (fixed in 18.11.0); version 18.12.0 only; version 19.0.0 only
• OpenSSL OpenSSL: from 3.0.0, before 3.0.7 (fixed in 3.0.7)

Published 2022-11-01. Last modified 2026-06-17.