Ubuntu alert USN-8063-2 (protobuf)

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noreply+usn-bot@canonical.com
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ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8063-2] Protocol Buffers vulnerability
Date:
             
 
Tue, 26 May 2026 21:05:54 +0000
Message-ID:
             
 
<E1wRyyI-0007DJ-3Z@lists.ubuntu.com>
==========================================================================
Ubuntu Security Notice USN-8063-2
May 26, 2026

protobuf vulnerability
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

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

Software Description:
- protobuf: protocol buffers data serialization library

Details:

USN-8063-1 fixed a vulnerability in Protocol Buffers. This update provides
the corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Original advisory details:

 It was discovered that Protocol Buffers incorrectly handled recursion
 when the Python google.protobuf.json_format.ParseDict() function is  being
 used. An attacker could possibly use this issue to cause  Protocol Buffers
 to consume resources, resulting in a denial of  service.

Update instructions:

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

Ubuntu 20.04 LTS
  libprotobuf17                   3.6.1.3-2ubuntu5.2+esm3
                                  Available with Ubuntu Pro
  python-protobuf                 3.6.1.3-2ubuntu5.2+esm3
                                  Available with Ubuntu Pro
  python3-protobuf                3.6.1.3-2ubuntu5.2+esm3
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libprotobuf10                   3.0.0-9.1ubuntu1.1+esm4
                                  Available with Ubuntu Pro
  python-protobuf                 3.0.0-9.1ubuntu1.1+esm4
                                  Available with Ubuntu Pro
  python3-protobuf                3.0.0-9.1ubuntu1.1+esm4
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-8063-2
  https://ubuntu.com/security/notices/USN-8063-1
  CVE-2026-0994


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