# CVE-2026-82059

## Summary

- **CVE ID:** CVE-2026-82059
- **Severity:** MEDIUM
- **CVSS Score:** 6 (CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-617
- **Published:** Sep 8, 2026
- **Last Modified:** Sep 8, 2026

## Description

An internal aggregation expression in MongoDB Server was incorrectly registered as accessible to any authenticated user rather than being restricted to internal cluster operations. By crafting a malformed index specification within this expression, an authenticated user with read-only privileges could trigger an assertion failure in the index key generation code path. In certain build configurations, this assertion failure results in termination of the mongod process, causing a denial of service to all connected clients.

## Affected Products

- MongoDB — MongoDB Server (8.3.0)
- MongoDB — MongoDB Server (8.0.0)
- MongoDB — MongoDB Server (7.0.0)

## References

- [CNA](https://jira.mongodb.org/browse/SERVER-130571)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._