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1 vulnerability
CVE-2026-14178 (GCVE-0-2026-14178)
Vulnerability from cvelistv5 – Published: 2026-06-30 13:56 – Updated: 2026-06-30 14:40
VLAI?
Title
openGauss存在非法内存访问导致DoS漏洞
Summary
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。
Severity ?
5.9 (Medium)
CWE
- CWE-416 - Use after free
Assigner
References
Impacted products
| Vendor | Product | Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| openGauss-server | openGauss-server-7.0.0-RC2 |
Affected:
openGauss-server-7.0.0-RC2
|
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|
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