# 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.

- **Severity:** High 8.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-88032, GHSA-38pq-38pp-9f4m, UBUNTU-CVE-2026-88032

## 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 (Use After Free)

## Which versions are affected by CVE-2026-88032?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2026-18710/): Cleartext Storage of Sensitive Information in MongoDB Driver Logging During Client Initialization (high 8.2)
- [CVE-2021-20328](https://insights.sbomify.com/CVE-2021-20328/): MongoDB Java driver client-side field level encryption not verifying KMS host name (medium 6.4)
- [CVE-2026-88033](https://insights.sbomify.com/CVE-2026-88033/): GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoDB Java Driver (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88032 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-88032 in the wild and no public exploit code.

Affected product: MongoDB Java Driver. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-88032/ (Markdown: https://insights.sbomify.com/CVE-2026-88032/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88032
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88032
- OSV: https://osv.dev/vulnerability/CVE-2026-88032

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-88032/
Summaries are generated and may contain mistakes; the official description above is the record.