USN-7629-2: Protocol Buffers vulnerabilities

USN-7435-1 and USN-7629-1 fixed vulnerabilities in Protocol Buffers
for several releases of Ubuntu. This update provides the corresponding
fixes for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that Protocol Buffers incorrectly handled memory when
receiving malicious input using the Python bindings. An attacker could
possibly use this issue to cause a denial of service. (CVE-2025-4565)

It was discovered that Protocol Buffers incorrectly handled memory when
receiving malicious input using the Java bindings. An attacker could
possibly use this issue to cause a denial of service. This issue only
affected Ubuntu 25.04. (CVE-2024-7254)