ZDI-26-789: OpenSSL CMP Use of Externally-Controlled Format String Information Disclosure Vulnerability
Published Oct 22, 2026
·Updated
This vulnerability allows remote attackers to disclose sensitive information on affected installations of OpenSSL. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 6.5. The following CVEs are assigned: CVE-2026-63073.
Affected Software
1 affected component
OpenSSL OpenSSL
Event History
Oct 22, 2026
Advisory Published
via ZDI·05:00 AM
Data Sourced
via ZDI·05:00 AM
Description
Frequently Asked Questions
1
Does exploiting this issue require authentication?
No. The vulnerability can be exploited remotely without authentication.
2
What is the security impact of successful exploitation?
A remote attacker may disclose sensitive information from an affected OpenSSL installation.
3
Which identifier should be used to track this vulnerability?
The assigned CVE is CVE-2026-63073.