OpenSSL Improper Check for Unusual or Exceptional Conditions Vulnerability - CVE-2026-22795

Issue summary: An invalid or NULL pointer dereference can happen in an application processing a malformed PKCS12 file. Impact summary: An application processing a malformed PKCS12 file can be caused to dereference an invalid or NULL pointer on memory read resulting in a Denial of Service. A type confusion vulnerability exists in PKCS12 parsing code where an ASN1_TYPE union member is accessed without first validating the type causing an invalid pointer read. The location is constrained to a 1-byte address space meaning any attempted pointer manipulation can only target addresses between 0x00 and 0xFF. This range corresponds to the zero page which is unmapped on most modern operating systems and will reliably result in a crash leading only to a Denial of Service. Exploiting this issue also requires a user or application to process a maliciously crafted PKCS12 file. It is uncommon to accept untrusted PKCS12 files in applications as they are usually used to store private keys which are trusted by definition. For these reasons the issue was assessed as Low severity. The FIPS modules in 3.5 3.4 3.3 and 3.0 are not affected by this issue as the PKCS12 implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6 3.5 3.4 3.3 3.0 and 1.1.1 are vulnerable to this issue. OpenSSL 1.0.2 is not affected by this issue.