{"timestamp":"2026-06-30T14:39:56.155795Z","id":"CVE-2026-14178","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

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。

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-416

https://gitcode.com/opengauss/openGauss-server/pull/8877

[{"vendor":"openGauss-server","product":"openGauss-server-7.0.0-RC2","defaultStatus":"affected","collectionURL":"https://opengauss.org/zh/download/archive/?version=7.0.0-RC2","platforms":["openEuler","Centos"],"versions":[{"version":"openGauss-server-7.0.0-RC2","status":"affected"}]},{"vendor":"openGauss-server","product":"openGauss-server-7.0.0-RC1","defaultStatus":"affected","collectionURL":"https://opengauss.org/zh/download/archive/?version=7.0.0-RC1","platforms":["openEuler","Centos"],"versions":[{"version":"openGauss-server-7.0.0-RC1","status":"affected"}]},{"vendor":"openGauss-server","product":"openGauss-server-7.0.0-RC3","defaultStatus":"unaffected","collectionURL":"https://opengauss.org/zh/download/archive/?version=7.0.0-RC3","platforms":["openEuler Centos"],"versions":[{"version":"openGauss-server-7.0.0-RC3","status":"unaffected"}]}]