CVE-2026-11933 Post-authentication use-after-free in server-side JavaScript BSON-to-array conversion
Authenticated users can trigger a use-after-free in MongoDB's JavaScript engine, leading to memory disclosure or server 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-2026-11933?
CVE-2026-11933 is a high-severity use after free vulnerability in Mongodb Mongodb, published on 12 Jun 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 Server's server-side JavaScript engine when converting BSON documents to JavaScript arrays. An authenticated user with read privileges who is able to run server-side JavaScript (for example, via $where or $function) can cause the server to access memory that has already been freed. This may result in disclosure of information from the mongod process memory or a denial of service through a server crash.
Which versions are affected by CVE-2026-11933?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | From 4.4.0 | 4.4.31, 5.0.34, 6.0.29, 7.0.37, 8.0.26, 8.2.11, 8.3.4 |
Products include Mongodb Mongodb.
How do I fix CVE-2026-11933?
Upgrade mongodb to a fixed version for your release line: 4.4.31, 5.0.34, 6.0.29 or 7.0.37.
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-2026-11933 being exploited?
There is no known exploitation of CVE-2026-11933 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-2026-11933, GHSA-x5xf-rwjm-436w, MINI-85xj-v226-84gr, MINI-9wqx-r496-ggv7, MINI-c945-7gfg-r3jh, MINI-x3g3-p2v3-9xqv and 1 more.