CVE-2026-111439: Auth Bypass (CVSS 4.3)

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。

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0026

Probability of exploitation

0.18%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-862 Missing Authorization

References

Other References

https://gitcode.com/opengauss/openGauss-server/pull/9374

Frequently Asked Questions

What is CVE-2026-111439? +

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。 It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-111439? +

CVE-2026-111439 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0026, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-111439? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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