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Ubuntu Security Notice USN-7629-2
September 02, 2025

protobuf vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Protocol Buffers could be made to crash if it received specially crafted
input.

Software Description:
- protobuf: protocol buffers data serialization library

Details:

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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS
  libprotobuf-java                3.6.1.3-2ubuntu5.2+esm2
                                  Available with Ubuntu Pro
  python3-protobuf                3.6.1.3-2ubuntu5.2+esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libprotobuf-java                3.0.0-9.1ubuntu1.1+esm3
                                  Available with Ubuntu Pro
  python3-protobuf                3.0.0-9.1ubuntu1.1+esm3
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libprotobuf-java                2.6.1-1.3ubuntu0.1~esm4
                                  Available with Ubuntu Pro
  python-protobuf                 2.6.1-1.3ubuntu0.1~esm4
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-7629-2
  https://ubuntu.com/security/notices/USN-7629-1
  CVE-2024-7254, CVE-2025-4565