CVE-2026-88032 Application denial of service via cancellation race in reactive client-side encryption in MongoDB Java Driver
An attacker can cause a denial of service in applications using the MongoDB Java Driver by triggering a use-after-free during cancelled reactive encryption operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88032?
CVE-2026-88032 is a high-severity use after free vulnerability in MongoDB Java Driver, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A use-after-free in the reactive client-side encryption component of the MongoDB Java Driver can cause native resources to be freed while an affected encrypted operation is still using them when the operation is cancelled. A party able to cause such an operation to be cancelled may cause the hosting application process to terminate. Reaching the issue requires an affected reactive encryption configuration that retrieves KMS credentials on demand.
Weakness: CWE-416
Which versions are affected by CVE-2026-88032?
It affects 1 product.
Products include Mongodb Java Driver.
How do I fix CVE-2026-88032?
No fix has been published for CVE-2026-88032 yet. Limit exposure of the affected software until one is available.
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-2026-88032 being exploited?
There is no known exploitation of CVE-2026-88032 in the wild and no public exploit code.
Other vulnerabilities in MongoDB Java Driver
- CVE-2026-18710 Cleartext Storage of Sensitive Information in MongoDB Driver Logging During Client Initialization
- CVE-2021-20328 MongoDB Java driver client-side field level encryption not verifying KMS host name
- CVE-2026-88033 GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoDB Java Driver
Sources
Also known as DEBIAN-CVE-2026-88032, GHSA-38pq-38pp-9f4m, UBUNTU-CVE-2026-88032.