CVE-2026-18688

EUVD-2026-56904
An issue in MongoDB Server's aggregation framework could allow an authenticated user to trigger an out-of-bounds memory read by providing a specially formed numeric parameter in a certain aggregation pipeline stage. This could result in a server crash (denial of service) and may potentially expose a limited amount of memory contents.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mongodbCNA
7.1 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mongodbmongodb
8.3.0 ≤
𝑥
< 8.3.8
CNA
mongodbmongodb
8.0 ≤
𝑥
< 8.0.29
CNA
mongodbmongodb
7.0 ≤
𝑥
< 7.0.40
CNA
Common Weakness Enumeration
References
https://jira.mongodb.org/browse/SERVER-129617