mongo-c-driver 2.5.3

The Official MongoDB driver for C language

Release notes

Announcing 2.5.3 of libbson and libmongoc, the libraries constituting the MongoDB C Driver.

# libbson

No changes since 2.5.2. Version incremented to match the libmongoc version.

# libmongoc

## Fixes

* Use exact match for file ID in GridFS methods CVE-2026-88036
* Validate SASL username CVE-2026-88035


# Links:


* [All the issues resolved in 2.5.3](https://jira.mongodb.org/issues/?jql=project%3D%22C%20Driver%22%20and%20fixVersion%3D%222.5.3%22)
* [Documentation](https://mongoc.org/)


Thanks to everyone who contributed to this release.

- Connor MacDonald
- Kevin Albertson

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