CVE-2026-18709: mongodb from 7.0.0 (inclusive), before 7.0.40 (exclusive), from 8.0.0 (inclusive), before 8.0.29 (exclusive), from…

Affected technology

mongodb · from 7.0.0 (inclusive), before 7.0.40 (exclusive)
mongodb

mongodb · from 8.0.0 (inclusive), before 8.0.29 (exclusive)
mongodb

mongodb · from 8.2.0 (inclusive), through 8.2.12 (inclusive)
mongodb

mongodb · from 8.3.0 (inclusive), before 8.3.8 (exclusive)
mongodb

mongodb · 9.0.0 · update alpha0
mongodb

mongodb · 9.0.0 · update alpha1
mongodb

mongodb · 9.1.0 · update alpha0
mongodb

MongoDB Server · 8.3.0 to before 8.3.8, 8.0 to before 8.0.29, 7.0 to before 7.0.40
MongoDB

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Adjacent network · Low privileges required · No user interaction required

What an attacker can do

An authenticated user with direct network access to a shard could improperly commit or abort an in-progress prepared transaction, bypassing the intended transaction coordination process. Vendor/CNA’s CVSS 4.0 assessment (base score 5.9/10) rates confidentiality impact as none; integrity and availability impact as high.