CVE-2022-3786
X.509 Email Address Variable Length Buffer Overflow
- Published
- Nov 1, 2022
- Updated
- Apr 14, 2026
- Assigning CNA
- openssl
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HHigh · next 30 days
- Percentile
- 99.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
4Python-based scanner that detects OpenSSL 3.0.0-3.0.6 servers vulnerable to CVE-2022-3602 and CVE-2022-3786 by checking client authentication requirements on single or multiple targets.
- OpenSSL-2022Informational
Operational information regarding CVE-2022-3602 and CVE-2022-3786, two vulnerabilities in OpenSSL 3
Responsible use
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