Mongodb Libmongocrypt
CVE-2026-84962
An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and defeating client-side encryption.
What this means for your business
- It affects Mongodb Libmongocrypt. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, with an administrator login, but only after tricking someone into an action such as opening a file or a link.
- FIRST's prediction model gives it a 0.1% chance of attack attempts being seen in the next 30 days, ranking above 1% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Mongodb Libmongocrypt, 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.
Fastnexa security experts
Not sure if your company is exposed to CVE-2026-84962?
Tell us where you run Mongodb Libmongocrypt and a Fastnexa penetration tester will check whether this flaw, or others like it, can be used against your websites, apps and network.
The full test is free for our first 10 founding clients until 31 December 2026. See the offer
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Scoring
- CVSS
- 4.2 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N- CVSS v4
- 5.7
- Weakness
- CWE-93
- Assigned by
- cna@mongodb.com
Dates
- Published
- 2026-09-03
- Last modified
- 2026-09-17
- Sources
- NVD
Affected products
- Mongodb Libmongocrypt- 1.20.2
As listed in the NVD configuration data. Not a statement about your estate.