CVE-2026-14178
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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。
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| openGauss-server | openGauss-server-7.0.0-RC2 | openGauss-server-7.0.0-RC2 | affected |
| openGauss-server | openGauss-server-7.0.0-RC1 | openGauss-server-7.0.0-RC1 | affected |
| openGauss-server | openGauss-server-7.0.0-RC3 | openGauss-server-7.0.0-RC3 | unaffected |
Weaknesses
- CWE-416: CWE-416 Use after free
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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