CVE-2026-63076

A flaw was found in OpenSSL. A crafted CMP (Certificate Management Protocol) message can cause an invalid pointer dereference due to a missing type check in the password-based protection verification. A remote, unauthenticated attacker can crash applications acting as a CMP server or client, resulting in a denial of service.

To exploit this issue, an attacker needs to supply a crafted CMP message to an application acting as a CMP server or client. Server applications need to be configured to accept PBM-protected messages, and client applications need to communicate with a malicious or intercepted CMP server. The missing type check causes an invalid pointer dereference, resulting in a denial of service. There is no memory disclosure, no controlled memory write and no path to code execution. For these reasons, this vulnerability has been rated with a moderate severity.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.