Use-After-Free Vulnerability in MongoDB for Sharded Clusters
CVE-2026-4148

8.7HIGH

Key Information:

Vendor

MongoDB
Status
Mongodb Server
Vendor
CVE Published:
17 March 2026

What is CVE-2026-4148?

A use-after-free vulnerability found in MongoDB’s handling of sharded clusters allows an authenticated user with read permissions to exploit the system. By issuing a specially crafted $lookup or $graphLookup aggregation pipeline, an attacker can initiate this vulnerability, potentially leading to unpredictable behavior and unauthorized data access. Immediate attention is recommended to safeguard against potential exploitation.

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Affected Version(s)

MongoDB Server 8.2 < 8.2.6

MongoDB Server 8.0 < 8.0.20

MongoDB Server 7.0 < 7.0.31

References

https://jira.mongodb.org/browse/SERVER-119319

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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