A nspr enhancement update has been released for CentOS 6

CentOS Errata and Enhancement Advisory 2019:3280
Upstream details at : https://access.redhat.com/errata/RHEA-2019:3280 
The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename )
i386:
1d3ff6e3e00c338c5afad2934ced1be065cec2d46df814da71a4f660378e504c nspr-4.21.0-1.el6_10.i686.rpm
2e3cfda21690d3cc620de6a77df083226d03766fc1f16292538719423b2aa35f nspr-devel-4.21.0-1.el6_10.i686.rpm
x86_64:
1d3ff6e3e00c338c5afad2934ced1be065cec2d46df814da71a4f660378e504c nspr-4.21.0-1.el6_10.i686.rpm
b17f2cbae1a06c80f64a459978b5fc36d12f8c447e7cae02c0950813e34a03bb nspr-4.21.0-1.el6_10.x86_64.rpm
2e3cfda21690d3cc620de6a77df083226d03766fc1f16292538719423b2aa35f nspr-devel-4.21.0-1.el6_10.i686.rpm
7b65c952f07581731c7fa747a00ca1e5948eaa78d8c52e6db0f2c3bff8461e3d nspr-devel-4.21.0-1.el6_10.x86_64.rpm
Source:
2ad5199672b8186f3947049f83c45fc23598e8e3bf60342946746ce499401a75 nspr-4.21.0-1.el6_10.src.rpm