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CVE-2026-111439— 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

Quick assessment

Affected
openGauss-server openGauss-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

In the module of openGauss-server, the built-in function contains a privilege validation flaw. At its entry point, the function only validates the range of the starting block number ( ) and the block count ( ), then directly invokes the low-level file reading

CVSS 4.3 · Medium EPSS 0.26% · P17

Affected Version Matrix 9

VendorProduct Version RangeStatus
openGauss-server openGauss-server 7.0.0-LTS unaffected
3.0.0-3.0.5 affected
3.1.0-3.1.1 affected
5.0.0-RC1 affected
5.0.0-5.0.3 affected
5.1.0 affected
6.0.0-RC1 affected
6.0.0-6.0.6 affected
… +1 more rows
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I. Basic Information for CVE-2026-111439

Vulnerability Information
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Vulnerability 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
Source: CVE Program / CVE List V5
Vulnerability Description
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。 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。
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openGauss-server openGauss-server 3.0.0-3.0.5 -

II. Public POCs for CVE-2026-111439

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III. Intelligence Information for CVE-2026-111439

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Patches & Fixes for CVE-2026-111439 (1)

Same Patch Batch · openGauss-server · 2026-10-19 · 4 CVEs total

CVE-2026-111441 8.1 HIGH HLL 反序列化 lenTotal/lenUsed 校验缺失导致堆越界写
CVE-2026-111440 7.0 HIGH JDBC LogFactory 任意类加载/构造导致潜在 RCE
CVE-2026-111438 6.5 MEDIUM check_hba_replication 认证与访问控制绕过

IV. Related Vulnerabilities

Same product: openGauss-server
Same vendor: openGauss-server
Same weakness: CWE-862

V. Comments for CVE-2026-111439

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