# 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.

- **Severity:** High 7.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Jun 2026
- **Updated:** 10 Jun 2026
- **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, UBUNTU-CVE-2026-9753

## 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.

Weakness: CWE-787 (Out-of-bounds Write), CWE-1287 (Improper Validation of Specified Type of Input)

## Which versions are affected by CVE-2026-9753?

1 open source package ship an affected version, including mongodb. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mongodb` | Bitnami | All versions | 7.0.35, 8.0.24, 8.2.10, 8.3.3 |

Products: 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.

## 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](https://insights.sbomify.com/CVE-2025-14847/): MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency (high 8.7, exploited in the wild)
- [CVE-2026-82067](https://insights.sbomify.com/CVE-2026-82067/): Auth bypass in MongoDB Server (critical 9.2)
- [CVE-2026-13072](https://insights.sbomify.com/CVE-2026-13072/): MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption (critical 9.2)
- [CVE-2017-15535](https://insights.sbomify.com/CVE-2017-15535/): Denial of service in n/a (critical 9.1)
- [CVE-2026-18691](https://insights.sbomify.com/CVE-2026-18691/): Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9753 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-9753 in the wild and no public exploit code.

Affected packages and fixed versions:
- mongodb (Bitnami): affected all versions; fixed in 7.0.35, 8.0.24, 8.2.10, 8.3.3

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-2026-9753/ (Markdown: https://insights.sbomify.com/CVE-2026-9753/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9753
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9753
- OSV: https://osv.dev/vulnerability/CVE-2026-9753

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9753/
Summaries are generated and may contain mistakes; the official description above is the record.