{"id":"CVE-2026-111439","title":"pg_read_binary_file_blocks 缺少初始用户权限校验，普通用户可读取 relation 文件块","summary":"在 openGauss-server的 src/common/backend/utils/adt/genfile.cpp 模块中，内置函数 pg_read_binary_file_blocks() 存在权限校验逻辑缺陷。该函数在入口处仅校验了起始块号（startBlockNum）和块数量（blockCount）的范围，随后直接调用底层文件读取例程 ReadBinaryFileBlocksFirstCall()。该底层例程仅执行了路径规范化检查以及针对 .. 路径遍历和数…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-862"],"vendor":"openGauss-server","product":"openGauss-server","affected":["openGauss-server 3.0.0-3.0.5","openGauss-server 3.1.0-3.1.1","openGauss-server 5.0.0-RC1","openGauss-server 5.0.0-5.0.3","openGauss-server 5.1.0","openGauss-server 6.0.0-RC1","openGauss-server 6.0.0-6.0.6","openGauss-server 7.0.0-RC1, 7.0.0-RC2, 7.0.0-RC3"],"published":"2026-10-19","updated":"2026-10-19","sourceUpdated":"2026-10-19T07:59:44.700Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111439","references":[{"url":"https://gitcode.com/opengauss/openGauss-server/pull/9374"}],"tags":["cve.org"],"ingestedAt":"2026-10-19T08:15:01.882Z","slug":"CVE-2026-111439","body":"## Overview\n\n在 openGauss-server的 src/common/backend/utils/adt/genfile.cpp 模块中，内置函数 pg_read_binary_file_blocks() 存在权限校验逻辑缺陷。该函数在入口处仅校验了起始块号（startBlockNum）和块数量（blockCount）的范围，随后直接调用底层文件读取例程 ReadBinaryFileBlocksFirstCall()。该底层例程仅执行了路径规范化检查以及针对 .. 路径遍历和数据目录边界的基本检查，缺失了对调用者数据库权限（如 SELECT 权限）的校验。此外，辅助函数 is_row_data_file() 也仅用于识别文件形态，未包含权限检查。因此，任何拥有普通数据库连接权限的用户，只要能够通过 pg_relation_filepath() 等函数获取到目标表的底层关系文件路径（例如压缩数据的 _compress 文件路径），即可无需具备该表的 SELECT 权限，直接读取表数据的二进制块。\n此漏洞影响此前3.0.0到6.0.0间的所有版本及补丁版，并在7.0.0-LTS版本修复。修复patch详见：https://gitcode.com/opengauss/openGauss-server/pull/9374。\n\n## Affected\n\n- `openGauss-server 3.0.0-3.0.5`\n- `openGauss-server 3.1.0-3.1.1`\n- `openGauss-server 5.0.0-RC1`\n- `openGauss-server 5.0.0-5.0.3`\n- `openGauss-server 5.1.0`\n- `openGauss-server 6.0.0-RC1`\n- `openGauss-server 6.0.0-6.0.6`\n- `openGauss-server 7.0.0-RC1, 7.0.0-RC2, 7.0.0-RC3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}