openGauss up to 7.0.0-RC3 HLL hll.cpp HllObjectUnpack lenUsed/lenTotal heap-based overflow

Summaryinfo

A vulnerability, which was classified as problematic, has been found in openGauss up to 7.0.0-RC3. The affected element is the function HllObjectUnpack of the file src/gausskernel/cbb/utils/hll/hll.cpp of the component HLL. Performing a manipulation of the argument lenUsed/lenTotal results in heap-based overflow. This vulnerability is identified as CVE-2026-111441. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in openGauss up to 7.0.0-RC3. It has been classified as problematic. This affects the function HllObjectUnpack of the file src/gausskernel/cbb/utils/hll/hll.cpp of the component HLL. The manipulation of the argument lenUsed/lenTotal with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on integrity, and availability. The summary by CVE is:

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 。

The advisory is shared at gitcode.com. This vulnerability is uniquely identified as CVE-2026-111441 since 10/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available.

Upgrading to version 7.0.0-LTS eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• openGauss

Version

• 2.1.0
• 3.0.x
• 3.1.x
• 5.0.x
• 5.1.0
• 6.0.x
• 7.0.0-RC1
• 7.0.0-RC2
• 7.0.0-RC3

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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