CVE-2026-82052 $regexFindAll may crash mongod server when byte-matching multi-byte UTF-8 chars
An authenticated user can crash the MongoDB server by triggering an assertion error via specific regex operations on multi-byte characters.
- 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-2026-82052?
CVE-2026-82052 is a high-severity denial of service vulnerability in Mongodb Mongodb, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The $regexFindAll expression can be used by an authenticated user who can run aggregation pipeline stages to crash a MongoDB server (mongod). Under certain specific conditions the regex match can start in the middle of a multi-code-unit character, triggering an assertion during query execution.
Weakness: CWE-617
Which versions are affected by CVE-2026-82052?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | From 7.0.0 | 7.0.41, 8.0.30, 8.3.9 |
Products include Mongodb Mongodb.
How do I fix CVE-2026-82052?
Upgrade mongodb to a fixed version for your release line: 7.0.41, 8.0.30 or 8.3.9.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-82052 being exploited?
There is no known exploitation of CVE-2026-82052 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-2026-82052, GHSA-p5gh-5wmf-x9p2, MINI-5pcc-p2wx-72cq, MINI-9rjm-pwxm-8c36, MINI-hjm3-p9j5-wxgq, UBUNTU-CVE-2026-82052.