CVE-2026-82066 Heap Out-of-Bounds Read in MongoDB Server Query Planning Component

What is CVE-2026-82066?

CVE-2026-82066 is a medium-severity vulnerability in Mongodb Mongodb, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A heap out-of-bounds read security issue exists in the query planning component of MongoDB Server. An authenticated user with database read and write privileges can trigger the security issue through crafted query operations, causing the server to read memory beyond allocated buffer boundaries. The revealed memory contents may be partially observable through diagnostic query statistics output.

Weakness: CWE-125

Which versions are affected by CVE-2026-82066?

1 open source package ship an affected version, including mongodb. It affects 1 product.

Products include Mongodb Mongodb.

How do I fix CVE-2026-82066?

Upgrade mongodb to a fixed version for your release line: 7.0.41, 8.0.30 or 8.3.9.

Is CVE-2026-82066 being exploited?

There is no known exploitation of CVE-2026-82066 in the wild and no public exploit code.

Other vulnerabilities in Mongodb Mongodb

• CVE-2025-14847 MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Exploited High 8.7
• CVE-2026-82067 Auth bypass in MongoDB Server Critical 9.2
• CVE-2026-13072 MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption Critical 9.2
• CVE-2017-15535 Denial of service in n/a Critical 9.1
• CVE-2026-18691 Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure Critical 9.0

All Mongodb Mongodb vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-mongodb-2026-82066, GHSA-m6gv-qfwj-frx8, MINI-gg4r-r9gh-cxvw, MINI-m6pc-jjfc-7px9, MINI-p952-m555-65wp, UBUNTU-CVE-2026-82066.