Home / mailings

PDF

[USN-8063-1] Protocol Buffers vulnerability

Posted on 25 February 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8063-1
February 25, 2026

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

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 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:

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 25.10
libprotobuf32t64 3.21.12-11ubuntu3.1
python3-protobuf 3.21.12-11ubuntu3.1

Ubuntu 24.04 LTS
libprotobuf32t64 3.21.12-8.2ubuntu0.3
python3-protobuf 3.21.12-8.2ubuntu0.3

Ubuntu 22.04 LTS
libprotobuf23 3.12.4-1ubuntu7.22.04.6
python3-protobuf 3.12.4-1ubuntu7.22.04.6

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

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

Package Information:
https://launchpad.net/ubuntu/+source/protobuf/3.21.12-11ubuntu3.1
https://launchpad.net/ubuntu/+source/protobuf/3.21.12-8.2ubuntu0.3
https://launchpad.net/ubuntu/+source/protobuf/3.12.4-1ubuntu7.22.04.6

--===============7483375536790952213==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

TOP