Ubuntu Security Notices USN-8063-1 USN-8063-1: Protocol Buffers vulnerability Publication date 25 February 2026 Overview Protocol Buffers could be made to consume resources if it received specially crafted input. Releases 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages 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. 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 In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 25.10 questing libprotobuf32t64 – 3.21.12-11ubuntu3.1 python3-protobuf – 3.21.12-11ubuntu3.1 24.04 LTS noble libprotobuf32t64 – 3.21.12-8.2ubuntu0.3 python3-protobuf – 3.21.12-8.2ubuntu0.3 22.04 LTS jammy libprotobuf23 – 3.12.4-1ubuntu7.22.04.6 python3-protobuf – 3.12.4-1ubuntu7.22.04.6 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-0994 CVE-2026-0994