mongo-c-driver 2.5.6

The Official MongoDB driver for C language

Release notes

Announcing 2.5.6 of libbson and libmongoc, the libraries constituting the MongoDB C Driver.

# libbson

* Fix edge case in Decimal128 parsing. CVE-2026-106438
* Enforce minimum size in `bson_reserve_buffer`. CVE-2026-106437
* Fix `bson_writer_new` when writing empty documents. CVE-2026-106431



# libmongoc

No changes since 2.5.5. Version incremented to match the libbson version.

# Links:


* [All the issues resolved in 2.5.6](https://jira.mongodb.org/issues/?jql=project%3D%22C%20Driver%22%20and%20fixVersion%3D%222.5.6%22)
* [Documentation](https://mongoc.org/)


Thanks to everyone who contributed to this release.

- Adrian Dole

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