mongodb/README.third_party.md

MongoDB Third Party Dependencies

MongoDB depends on third party libraries to implement some functionality. This document describes which libraries are depended upon, and how. It is maintained by and for humans, and so while it is a best effort attempt to describe the server’s dependencies, it is subject to change as libraries are added or removed.

Server Vendored Libraries

This is the list of third party libraries vendored into the server codebase, and the upstream source where updates may be obtained. These sources are periodically consulted, and the existence of new versions is reflected in this list. A ticket is filed in Jira if a determination is made to upgrade a vendored library.

Whenever a vendored library is included in released binary artifacts, is not authored by MongoDB, and has a license which requires reproduction, a notice will be included in THIRD-PARTY-NOTICES.

Name	License	Upstream Version	Vendored Version	Emits persisted data	Distributed in Release Binaries
abseil-cpp	Apache-2.0		070f6e47b3		✗
Aladdin MD5	Zlib		Unknown	✗	✗
ASIO	BSL-1.0	1.14.0	b0926b61b0		✗
benchmark	Apache-2.0	1.5.0	1.4.1
Boost	BSL-1.0	1.72.0	1.70.0		✗
fmt	BSD-2-Clause	6.1.2	6.1.1		✗
GPerfTools	BSD-3-Clause	2.7	2.7		✗
ICU4	ICU	64.2	57.1	✗	✗
Intel Decimal FP Library	BSD-3-Clause	2.0 Update 2	2.0 Update 1		✗
JSON-Schema-Test-Suite	MIT		728066f9c5
kms-message			75e391a037		✗
libstemmer	BSD-3-Clause		Unknown	✗	✗
linenoise	BSD-3-Clause		Unknown + changes		✗
MozJS	MPL-2.0	ESR 60.9	ESR 60.3.0		✗
MurmurHash3	Public Domain		Unknown + changes	✗	✗
ocspbuilder	MIT	0.10.2	0.10.2
ocspresponder	Apache-2.0	0.5.0	0.5.0
Pcre	BSD-3-Clause	8.43	8.42		✗
S2	Apache-2.0		Unknown	✗	✗
SafeInt	MIT	3.22	3.0.20p
scons	MIT	3.0.4	3.0.4
Snappy	BSD-3-Clause	1.1.7	1.1.7	✗	✗
timelib	MIT	2018.01	2018.01		✗
TomCrypt	Public Domain	1.18.2	1.18.2	✗	✗
Unicode	Unicode-DFS-2015	12.1.0	8.0.0	✗	✗
Valgrind	BSD-3-Clause[1]	3.15.0	3.11.0		✗
variant	BSL-1.0	1.4.0	1.3.0		✗
wiredtiger			[2]	✗	✗
yaml-cpp	MIT	0.6.3	0.6.2		✗
Zlib	Zlib	1.2.11	1.2.11	✗	✗
Zstandard	BSD-3-Clause	1.4.4	1.4.3	✗	✗

WiredTiger Vendored Test Libraries

The following Python libraries are transitively included by WiredTiger, and are used by that component for testing. They don’t appear in released binary artifacts.

Name
concurrencytest
discover
extras
python-subunit
testscenarios
testtools

Dynamically Linked Libraries

Sometimes MongoDB needs to load libraries provided and managed by the runtime environment. These libraries are not vendored into the MongoDB source directory, and are not compiled into release artifacts. Because they are provided by the runtime environment, the precise versions of these libraries cannot be known in advance. Further, these libraries may themselves load other libraries. The full set of transitively linked libraries will depend on the runtime environment, and cannot be outlined here. On Windows and Mac OS, other libraries and components provided by the Operating System may be loaded.

For Windows Enterprise, we may ship precompiled DLLs containing some of these libraries. Releases prepared in this fashion will include a copy of these libraries’ license in a file named THIRD-PARTY-NOTICES.windows.

Name	Enterprise Only	Has Windows DLLs
Cyrus SASL	Yes	Yes
libldap	Yes	No
net-snmp	Yes	Yes
OpenSSL	No	Yes[3]
libcurl	No	No

Notes:

1. ^ The majority of Valgrind is licensed under the GPL, with the exception of a single header file which is licensed under a BSD license. This BSD licensed header is the only file from Valgrind which is vendored and consumed by MongoDB.

2. ^ WiredTiger is maintained by MongoDB in a separate repository. As a part of our development process, we periodically ingest the latest snapshot of that repository.

3. ^ OpenSSL is only shipped as a dependency of the MongoDB tools written in Go. The MongoDB shell and server binaries use Windows’ cryptography APIs.