Mongodb C Driver
CVE-2026-88035
A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large user-name value is accepted and copied past the end of a small buffer. A party able to set the driver's connection settings may cause the application that embeds the driver to terminate unexpectedly. Reaching this code requires a build in which the optional external SASL authentication backend is present and a connection configured to use it.
What this means for your business
- It affects Mongodb C Driver. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it only with access to the machine itself, with an ordinary user login, and without anyone at your company clicking anything.
What to do
- 1Check whether your company or your suppliers run Mongodb C Driver, 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
- 4.7 (v3.1)
- Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H- CVSS v4
- 5.7
- Weakness
- CWE-190
- Assigned by
- cna@mongodb.com
Dates
- Published
- 2026-09-10
- Last modified
- 2026-09-16
- Sources
- NVD
Affected products
- Mongodb C Driver1.10.0 - 1.30.10, 2.2.0 - 2.5.3
As listed in the NVD configuration data. Not a statement about your estate.