CVE-2026-42767
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
An attacker-controlled CMP server could trigger a NULL pointer dereference in a CMP client application, leading to application crashes.
Risk Assessment
This vulnerability can cause application crashes, resulting in denial of service for users.
Recommendation
It is recommended to monitor and secure applications processing CMP/CRMF messages and to update to the latest version if possible.
Original NVD description (English source)
Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application. Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service. An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client. Applications that process untrusted CMP/CRMF messages may be affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.