CVE-2026-114655 KMS request injection via unsanitized key vault and provider values in libmongocrypt
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-114655?
CVE-2026-114655 is a medium-severity vulnerability in MongoDB libmongocrypt, published on 22 Oct 2026.
Official description
libmongocrypt builds requests to external key management services (AWS, Azure and GCP) by inserting values from key vault documents, KMS provider configuration and KMS responses into request lines, headers and signed request bodies without validating or encoding them for each context. A user with write access to the key vault collection can alter the structure of these requests, including adding members to request bodies and token claims that the library then signs with the application's credentials. This may result in key management operations being performed with parameters the application did not intend.
Weakness: CWE-74
Which versions are affected by CVE-2026-114655?
How do I fix CVE-2026-114655?
Upgrade to a fixed version.
Is CVE-2026-114655 being exploited?
There is no known exploitation of CVE-2026-114655 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-114655, GHSA-7mvq-mg47-m88j, UBUNTU-CVE-2026-114655.