AIKIDO-2026-774224
mongodb.libmongocrypt is vulnerable to Improper Input Validation
44
Medium Risk
This Affects:
mongodb.libmongocryptTL;DR
libmongocrypt builds MongoDB namespace strings from database and collection name arguments without validating their contents. When these identifiers carry externally influenced input, an embedded . in a database name can retarget an operation to a different namespace, and an embedded NUL byte can truncate a BSON collection or namespace name and cause inconsistent encryption and schema processing. These unchecked names let client-side encrypted operations be redirected across databases or collections. The fix rejects database and collection name arguments containing a . or a NUL byte.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you pass externally influenced or untrusted database or collection names into libmongocrypt APIs.
Background info
mongodb.libmongocrypt is vulnerable to Improper Input Validation in versions 0.0.1 - 1.20.2.
How to fix this
Upgrade the mongodb.libmongocrypt library to the patch version.
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