CVE-2026-18709

EUVD-2026-56883
An issue in MongoDB Server could allow an authenticated user with direct network access to a shard to improperly commit or abort an in-progress prepared transaction, bypassing the intended transaction coordination process. This could result in cross-shard data inconsistency, cluster clock corruption, and violation of transaction atomicity guarantees.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mongodbCNA
6.4 MEDIUM
ADJACENT_NETWORK
HIGH
LOW
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:H/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-130544