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CVE-2026-14178— openGauss存在非法内存访问导致DoS漏洞

Quick assessment

Affected
openGauss-server openGauss-server-7.0.0-RC2
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.

Huawei openGauss是中国Huawei公司开源的一款开源的关系型数据库管理系统，它具有多核高性能、全链路安全性、智能运维等企业级特性。 Huawei openGauss存在资源管理错误漏洞，该漏洞源于在处理带 NLS 参数的 to_timestamp 调用时，to_timestamp_with_fmt_nls() 将 nls_fmt_str 保存到 u_sess->parser_cxt.nls_fmt_str；在 seqscan + sort 执行路径下，该字符串被分配在 SeqScan 的表

CVSS 5.9 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
openGauss-server openGauss-server-7.0.0-RC1 openGauss-server-7.0.0-RC1 affected
openGauss-server openGauss-server-7.0.0-RC2 openGauss-server-7.0.0-RC2 affected
openGauss-server openGauss-server-7.0.0-RC3 openGauss-server-7.0.0-RC3 unaffected
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I. Basic Information for CVE-2026-14178

Vulnerability Information
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Vulnerability Title
openGauss存在非法内存访问导致DoS漏洞
Source: CVE Program / CVE List V5
Vulnerability Description
openGauss 在处理带 NLS 参数的 to_timestamp 调用时，to_timestamp_with_fmt_nls() 会将 nls_fmt_str 保存到 u_sess->parser_cxt.nls_fmt_str。在 seqscan + sort 执行路径下，该字符串原本被分配在 SeqScan 的表达式上下文中；当 SeqScan 完成后，该内存上下文会被 reset，但后续结果输出阶段 timestamp_out() 仍会通过 CheckNlsFormat() 访问 u_sess->parser_cxt.nls_fmt_str，导致访问已释放内存。攻击者在具备数据库 SQL 执行权限的情况下，可构造特定 to_timestamp(..., ..., nlsparam) 查询触发 heap-use-after-free。在 ASan/Memcheck 环境下表现为数据库服务退出；在实际运行环境中可能造成后端进程异常退出，影响数据库服务可用性，形成拒绝服务风险。该问题在openGauss-server-7.0.0-RC1版本和openGauss-server-7.0.0-RC2版本存在，目前已在openGauss-server-7.0.0-RC3版本修复。由于 openGauss-server-7.0.0-RC1版本和openGauss-server-7.0.0-RC2均为创新版本，不会发布针对性补丁包，涉及版本升级至 openGauss-server-7.0.0-RC3或更新版本即可。
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Huawei openGauss 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Huawei openGauss是中国Huawei公司开源的一款开源的关系型数据库管理系统，它具有多核高性能、全链路安全性、智能运维等企业级特性。 Huawei openGauss存在资源管理错误漏洞，该漏洞源于在处理带 NLS 参数的 to_timestamp 调用时，to_timestamp_with_fmt_nls() 将 nls_fmt_str 保存到 u_sess->parser_cxt.nls_fmt_str；在 seqscan + sort 执行路径下，该字符串被分配在 SeqScan 的表
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openGauss-server openGauss-server-7.0.0-RC2 openGauss-server-7.0.0-RC2 -
openGauss-server openGauss-server-7.0.0-RC1 openGauss-server-7.0.0-RC1 -
openGauss-server openGauss-server-7.0.0-RC3 - -

II. Public POCs for CVE-2026-14178

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III. Intelligence Information for CVE-2026-14178

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Patches & Fixes for CVE-2026-14178 (1)

IV. Related Vulnerabilities

Same vendor: openGauss-server
Same weakness: CWE-416

V. Comments for CVE-2026-14178

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