{"id":"USN-8063-2","summary":"protobuf vulnerability","details":"USN-8063-1 fixed a vulnerability in Protocol Buffers. This update provides\nthe corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n It was discovered that Protocol Buffers incorrectly handled recursion\n when the Python google.protobuf.json_format.ParseDict() function is  being\n used. An attacker could possibly use this issue to cause  Protocol Buffers\n to consume resources, resulting in a denial of  service.","modified":"2026-05-26T22:59:14.119783231Z","published":"2026-05-26T20:31:47Z","related":["UBUNTU-CVE-2026-0994"],"upstream":["CVE-2026-0994","UBUNTU-CVE-2026-0994"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8063-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-0994"}],"affected":[{"package":{"name":"protobuf","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/protobuf?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.0-9.1ubuntu1.1+esm4"}]}],"versions":["3.0.0-9ubuntu5","3.0.0-9ubuntu6","3.0.0-9.1ubuntu1","3.0.0-9.1ubuntu1.1","3.0.0-9.1ubuntu1.1+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libprotobuf-java","binary_version":"3.0.0-9.1ubuntu1.1+esm4"},{"binary_name":"libprotobuf-lite10","binary_version":"3.0.0-9.1ubuntu1.1+esm4"},{"binary_name":"libprotobuf10","binary_version":"3.0.0-9.1ubuntu1.1+esm4"},{"binary_name":"libprotoc10","binary_version":"3.0.0-9.1ubuntu1.1+esm4"},{"binary_name":"protobuf-compiler","binary_version":"3.0.0-9.1ubuntu1.1+esm4"},{"binary_name":"python-protobuf","binary_version":"3.0.0-9.1ubuntu1.1+esm4"},{"binary_name":"python3-protobuf","binary_version":"3.0.0-9.1ubuntu1.1+esm4"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-0994"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8063-2.json"}},{"package":{"name":"protobuf","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/protobuf?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.1.3-2ubuntu5.2+esm3"}]}],"versions":["3.6.1.3-2","3.6.1.3-2ubuntu1","3.6.1.3-2ubuntu3","3.6.1.3-2ubuntu4","3.6.1.3-2ubuntu5","3.6.1.3-2ubuntu5.2","3.6.1.3-2ubuntu5.2+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libprotobuf-java","binary_version":"3.6.1.3-2ubuntu5.2+esm3"},{"binary_name":"libprotobuf-lite17","binary_version":"3.6.1.3-2ubuntu5.2+esm3"},{"binary_name":"libprotobuf17","binary_version":"3.6.1.3-2ubuntu5.2+esm3"},{"binary_name":"libprotoc17","binary_version":"3.6.1.3-2ubuntu5.2+esm3"},{"binary_name":"protobuf-compiler","binary_version":"3.6.1.3-2ubuntu5.2+esm3"},{"binary_name":"python-protobuf","binary_version":"3.6.1.3-2ubuntu5.2+esm3"},{"binary_name":"python3-protobuf","binary_version":"3.6.1.3-2ubuntu5.2+esm3"},{"binary_name":"ruby-google-protobuf","binary_version":"3.6.1.3-2ubuntu5.2+esm3"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"id":"CVE-2026-0994","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8063-2.json"}}],"schema_version":"1.7.5"}