CVE-2026-9753 Server crash via malformed binary diff passed to $_internalApplyOplogUpdate.
An authenticated user can crash the MongoDB server or cause memory corruption by sending a malformed binary diff to the $_internalApplyOplogUpdate stage.
- 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-2026-9753?
CVE-2026-9753 is a high-severity memory corruption vulnerability in Mongodb Mongodb, published on 9 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The $_internalApplyOplogUpdate aggregation pipeline stage can be used to execute a document diff containing a malformed binary diff to return memory out-of-bounds or crash the server. $_internalApplyOplogUpdate can be executed by any authenticated user with access to the aggregate command.
Which versions are affected by CVE-2026-9753?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | All versions | 7.0.35, 8.0.24, 8.2.10, 8.3.3 |
Products include Mongodb Mongodb.
How do I fix CVE-2026-9753?
Upgrade mongodb to a fixed version for your release line: 7.0.35, 8.0.24, 8.2.10 or 8.3.3.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-9753 being exploited?
There is no known exploitation of CVE-2026-9753 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-2026-9753, GHSA-j72p-fv5p-4r63, MINI-24mf-8379-h2v4, MINI-2cxv-m5q6-p4jp, MINI-98cr-wxmq-fqr9, MINI-rmp4-2xjf-p3pr and 1 more.