7.5High
Mongodb Mongodb
CVE-2026-18697
An issue in MongoDB Server's aggregation framework could allow an unauthenticated party to cause a mongos (router) process to terminate unexpectedly by submitting a specially formed aggregation command. This could result in a denial of service, disrupting client connections routed through the affected mongos instance.
What this means for your business
- It affects Mongodb. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.3% chance of attack attempts being seen in the next 30 days, ranking above 27% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Mongodb, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- CVSS v4
- 8.7
- Weakness
- CWE-617
- Assigned by
- cna@mongodb.com
Dates
- Published
- 2026-08-11
- Last modified
- 2026-09-16
- Sources
- NVD
Affected products
- Mongodb Mongodb7.0.0 - 7.0.40, 8.0.0 - 8.0.29, 8.2.0 - 8.2.12, 8.3.0 - 8.3.8, 9.0.0, 9.1.0
As listed in the NVD configuration data. Not a statement about your estate.