Out-of-Bounds Memory Read in MongoDB Server's Aggregation Framework
CVE-2026-18688

7.1HIGH

Key Information:

Vendor

Mongodb
Status
Mongodb Server
Vendor
CVE Published:
11 August 2026

What is CVE-2026-18688?

An issue within the aggregation framework of MongoDB Server allows an authenticated user to exploit a specially crafted numeric parameter, leading to an out-of-bounds memory read. This flaw has the potential to result in a server crash through denial of service and may inadvertently reveal a limited amount of memory contents, posing a risk to data integrity.

Affected Version(s)

MongoDB Server 8.3.0 < 8.3.8

MongoDB Server 8.0 < 8.0.29

MongoDB Server 7.0 < 7.0.40

References

https://jira.mongodb.org/browse/SERVER-129617

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
Low
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.