{"id":"CVE-2026-111441","title":"HLL 反序列化 lenTotal/lenUsed 校验缺失导致堆越界写","summary":"在 openGauss-server 的 src/gausskernel/cbb/utils/hll/hll.cpp 中，内置函数 HllObjectUnpack() 存在长度校验缺陷。该函数从用户提供的 packed HLL 解析 lenUsed 与 lenTotal 后，仅检查输入长度足以覆盖 HLL_HEAD_SIZE + lenUsed，随后按 lenTotal 分配缓冲区、按 lenUsed 调用 memcpy_s() 拷贝输入，既未校验 lenTotal >…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","cvssSource":"cna","cwe":["CWE-122"],"vendor":"openGauss-server","product":"openGauss-server","affected":["openGauss-server","openGauss-server 7.0.0-RC1, 7.0.0-RC2 7.0.0-RC3","openGauss-server 2.1.0","openGauss-server 3.0.0-3.0.6","openGauss-server 3.1.0","openGauss-server 5.0.0-5.0.5","openGauss-server 6.0.0-6.0.6"],"published":"2026-10-19","updated":"2026-10-19","sourceUpdated":"2026-10-19T02:31:01.069Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111441","references":[{"url":"https://gitcode.com/opengauss/openGauss-server/pull/9380"}],"tags":["cve.org"],"ingestedAt":"2026-10-19T02:58:59.957Z","slug":"CVE-2026-111441","body":"## Overview\n\n在 openGauss-server 的 src/gausskernel/cbb/utils/hll/hll.cpp 中，内置函数 HllObjectUnpack() 存在长度校验缺陷。该函数从用户提供的 packed HLL 解析 lenUsed 与 lenTotal 后，仅检查输入长度足以覆盖 HLL_HEAD_SIZE + lenUsed，随后按 lenTotal 分配缓冲区、按 lenUsed 调用 memcpy_s() 拷贝输入，既未校验 lenTotal >= lenUsed，也将 memcpy_s() 目标大小写成 lenUsed 而非实际分配的 lenTotal，导致安全拷贝无法拦截越界写。hll_in()、hll_print()、hll_cardinality() 等 SQL 入口会走同一解包路径。因此，普通数据库连接用户只需构造 lenTotal 小于 lenUsed 的畸形 packed HLL（例如经 ::hll 进入 hll_in()），即可触发服务端堆越界写，存在内存破坏风险。此问题随 packed HLL 解包函数 HllObjectUnpack() 进入代码，v2.1.0 起即存在。受影响版本包括 2.1.0、3.0.x、3.1.x、5.0.x、5.1.0、6.0.x，以及 7.0.0-RC1、7.0.0-RC2、7.0.0-RC3。该问题已在 7.0.0-LTS 版本修复，通过在 HllObjectUnpack() 中补齐 lenUsed <= lenTotal 校验，并将 memcpy_s() 的目标大小改为实际分配的 lenTotal。修复 PR 见 https://gitcode.com/opengauss/openGauss-server/pull/9380 。\n\n## Affected\n\n- `openGauss-server`\n- `openGauss-server 7.0.0-RC1, 7.0.0-RC2 7.0.0-RC3`\n- `openGauss-server 2.1.0`\n- `openGauss-server 3.0.0-3.0.6`\n- `openGauss-server 3.1.0`\n- `openGauss-server 5.0.0-5.0.5`\n- `openGauss-server 6.0.0-6.0.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}