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CVE-2026-4148— ExpressionContext use-after-free in classic engine $lookup and $graphLookup aggregation operators

Quick assessment

Affected
MongoDB Inc MongoDB Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server存在安全漏洞，该漏洞源于经过身份验证的用户在分片集群中发出特制的$lookup或$graphLookup聚合管道时可能触发释放后重用漏洞。

CVSS 8.8 · High EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-4148

Vulnerability Information
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Vulnerability Title
ExpressionContext use-after-free in classic engine $lookup and $graphLookup aggregation operators
Source: CVE Program / CVE List V5
Vulnerability Description
A use-after-free vulnerability can be triggered in sharded clusters by an authenticated user with the read role who issues a specially crafted $lookup or $graphLookup aggregation pipeline.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server存在安全漏洞，该漏洞源于经过身份验证的用户在分片集群中发出特制的$lookup或$graphLookup聚合管道时可能触发释放后重用漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB Inc MongoDB Server 8.2 ~ 8.2.6 -

II. Public POCs for CVE-2026-4148

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III. Intelligence Information for CVE-2026-4148

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Patches & Fixes for CVE-2026-4148 (1)

Same Patch Batch · MongoDB Inc · 2026-03-17 · 4 CVEs total

CVE-2026-4147 6.5 MEDIUM Stack memory disclosure in filemd5 command
CVE-2026-4358 6.4 MEDIUM Memory safety issues in slot-based execution hash table spill
CVE-2026-4359 2.0 LOW Heap-buffer-over-read in _mongoc_http_send via strstr on non-null-terminated buffer

IV. Related Vulnerabilities

Same product: MongoDB Server
Same vendor: MongoDB Inc
Same weakness: CWE-416

V. Comments for CVE-2026-4148

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