---
id: "CVE-2026-111441"
kind: "vulnerability"
aliases: ["CVE-2026-111441"]
title: "openGauss: crafted packed HLL input overflows server heap in HllObjectUnpack"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["database", "hll", "opengauss", "runtime", "self-hosted"]
not_affected_if: ["7.0.0-lts", "patched-version"]
published_at: "2026-10-19T03:16:58+00:00"
first_seen_at: "2026-10-23T21:57:17+00:00"
updated_at: "2026-10-25T03:06:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111441", "first_seen_at": "2026-10-23T21:57:17+00:00"}]
---

# openGauss: crafted packed HLL input overflows server heap in HllObjectUnpack

openGauss's HllObjectUnpack() in hll.cpp checks only that the input covers the used length, then allocates by the total length and copies by the used length without checking that total is at least used. A database user who sends a malformed packed HLL, for example via ::hll into hll_in(), can trigger a heap out-of-bounds write on the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the openGauss-server version in use; the description lists affected versions 2.1.0, 3.0.x, 3.1.x, 5.0.x, 5.1.0, 6.0.x and 7.0.0-RC1 through RC3.
- Confirm whether the installed build includes the fix from PR https://gitcode.com/opengauss/openGauss-server/pull/9380 (fixed in 7.0.0-LTS).

## Fix

- Upgrade openGauss-server to 7.0.0-LTS or a build that includes PR 9380.
- Until patched, restrict which database users can run hll functions or cast input to ::hll.

## Timeline

- 2026-10-23T21:57:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111441

## From the sources

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 。

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