CVE-2026-8201 Use-After-Free in MongoDB FLE Query Analysis When Processing Positional Projections on Encrypted Fields
Attackers can trigger a use-after-free in MongoDB's FLE query analysis by crafting specific encrypted field queries, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-8201?
CVE-2026-8201 is a medium-severity use after free vulnerability in Mongodb Mongodb, published on 13 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A use-after-free vulnerability exists in MongoDB's Field-Level Encryption (FLE) query analysis component, affecting client-side uses of mongocryptd and crypt_shared. Triggering this vulnerability requires control over the structure of a client's FLE-related query.
This issue impacts MongoDB Server’s mongocryptd component v7.0 versions prior to 7.0.34, v8.0 versions prior to 8.0.23, v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.
Weakness: CWE-416
Which versions are affected by CVE-2026-8201?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | From 7.0.0 | 7.0.34, 8.0.23, 8.2.9, 8.3.2 |
Products include Mongodb Mongodb.
How do I fix CVE-2026-8201?
Upgrade mongodb to a fixed version for your release line: 7.0.34, 8.0.23, 8.2.9 or 8.3.2.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-8201 being exploited?
There is no known exploitation of CVE-2026-8201 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
- CVE-2026-82067 Auth bypass in MongoDB Server
- CVE-2026-13072 MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption
- CVE-2017-15535 Denial of service in n/a
- CVE-2026-18691 Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
Sources
Also known as BIT-mongodb-2026-8201, GHSA-r8cx-9wfm-r3m7, MINI-3w5q-r3cx-g6q6, MINI-66hc-cpjp-9959, MINI-f687-p474-978q, UBUNTU-CVE-2026-8201.