The NSS team has released Network Security Services (NSS) 3.40.1, which is a patch release for NSS 3.40
The HG tag is NSS_3_40_1_RTM. NSS 3.40.1 requires NSPR 4.20 or newer.
NSS 3.40 source distributions are available on ftp.mozilla.org for secure HTTPS download:
New in NSS 3.40.1
No new functionality is introduced in this release. This is a patch release to fix CVE-2018-12404
Bugs fixed in NSS 3.40.1
Bug 1485864 - Cache side-channel variant of the Bleichenbacher attack (CVE-2018-12404)
NSS 3.40.1 shared libraries are backward compatible with all older NSS 3.x shared libraries. A program linked with older NSS 3.x shared libraries will work with NSS 3.40.1 shared libraries without recompiling or relinking. Furthermore, applications that restrict their use of NSS APIs to the functions listed in NSS Public Functions will remain compatible with future versions of the NSS shared libraries.
Bugs discovered should be reported by filing a bug report with bugzilla.mozilla.org (product NSS).