NSS 3.70 release notes


Network Security Services (NSS) 3.70 was released on 5 August 2021.

Distribution Information

The HG tag is NSS_3_70_RTM. NSS 3.70 requires NSPR 4.32 or newer.

NSS 3.70 source distributions are available on ftp.mozilla.org for secure HTTPS download:

Other releases are available Releases.

Changes in NSS 3.70

  • Documentation: release notes for NSS 3.70.

  • Documentation: release notes for NSS 3.69.1.

  • Bug 1726022 - Update test case to verify fix.

  • Bug 1714579 - Explicitly disable downgrade check in TlsConnectStreamTls13.EchOuterWith12Max

  • Bug 1714579 - Explicitly disable downgrade check in TlsConnectTest.DisableFalseStartOnFallback

  • Formatting for lib/util

  • Bug 1681975 - Avoid using a lookup table in nssb64d.

  • Bug 1724629 - Use HW accelerated SHA2 on AArch64 Big Endian.

  • Bug 1714579 Change default value of enableHelloDowngradeCheck to true.

  • Formatting for gtests/pk11_gtest/pk11_hpke_unittest.cc

  • Bug 1726022 Cache additional PBE entries.

  • Bug 1709750 - Read HPKE vectors from official JSON.

  • Documentation: update for NSS 3.69 release.


NSS 3.70 shared libraries are backwards-compatible with all older NSS 3.x shared libraries. A program linked with older NSS 3.x shared libraries will work with NSS 3.70 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 on bugzilla.mozilla.org (product NSS).