The following updates are available for both CentOS 5 and 6:

CEEA-2016:2832 CentOS 5 tzdata Enhancement Update
CEEA-2016:2832 CentOS 6 tzdata Enhancement Update
CESA-2016:2825 Important CentOS 5 thunderbird Security Update
CESA-2016:2825 Important CentOS 6 thunderbird Security Update

CEEA-2016:2832 CentOS 5 tzdata Enhancement Update

CentOS Errata and Enhancement Advisory 2016:2832

Upstream details at : https://rhn.redhat.com/errata/RHEA-2016-2832.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
e11c441014d2a46d7e85ed4db026fbc2f9c0e008ad89c402696589db3f4893b0 tzdata-2016j-1.el5.i386.rpm
62b80a842298ca82ca815f649f3cb0a675d6544a77fa14756e6c15db2f7c9e50 tzdata-java-2016j-1.el5.i386.rpm

x86_64:
bcdcca7cbdc90b6d128d9f908e67159bff74b7bcd63c3245f00d6cd6593f56f1 tzdata-2016j-1.el5.x86_64.rpm
d38f22fd31f06b46012a47af034aa6098af98e59f9da9665e5047b324025f2b9 tzdata-java-2016j-1.el5.x86_64.rpm

Source:
f6f785b3ba7f4d1b9d4799d417976f839ec553efaf7fdf5bd728f0fd40fb979a tzdata-2016j-1.el5.src.rpm

CEEA-2016:2832 CentOS 6 tzdata Enhancement Update

CentOS Errata and Enhancement Advisory 2016:2832

Upstream details at : https://rhn.redhat.com/errata/RHEA-2016-2832.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
94711daa2f7540f86e4313316646551596431c259771937c3331430bfd5fb6c8 tzdata-2016j-1.el6.noarch.rpm
c3592026ffc22a0209ed8c694f6d61c3e8ab9bf7b11c8c4f3e940890ab9f443a tzdata-java-2016j-1.el6.noarch.rpm

x86_64:
94711daa2f7540f86e4313316646551596431c259771937c3331430bfd5fb6c8 tzdata-2016j-1.el6.noarch.rpm
c3592026ffc22a0209ed8c694f6d61c3e8ab9bf7b11c8c4f3e940890ab9f443a tzdata-java-2016j-1.el6.noarch.rpm

Source:
269fcb2024cf95221b18ddaface194532539927534eb88a872a0c08bb27a8ad9 tzdata-2016j-1.el6.src.rpm

CESA-2016:2825 Important CentOS 5 thunderbird Security Update

CentOS Errata and Security Advisory 2016:2825 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2016-2825.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
7251f6beb26fcb00598415eeaf517c73782cd93d61546cae8fee4d0f7a4071b6 thunderbird-45.5.0-1.el5.centos.i386.rpm

x86_64:
b37fd2b77f5597775d8ad56a518b5fb35ab1c09c03b731817edd56c4a65a6e6b thunderbird-45.5.0-1.el5.centos.x86_64.rpm

Source:
89b0a355885d6a9c753eb36af7e2c58ff3fb1c05c72438af2be24f3b35f65065 thunderbird-45.5.0-1.el5.centos.src.rpm

CESA-2016:2825 Important CentOS 6 thunderbird Security Update

CentOS Errata and Security Advisory 2016:2825 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2016-2825.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
b21002cf325311197b191b5b530f685a6501df24390836e0f2b82a0bfdb11258 thunderbird-45.5.0-1.el6.centos.i686.rpm

x86_64:
3e0df1347b13bbdbbe0e7563dd7a84bcd6c6818925b53393448e13128a359562 thunderbird-45.5.0-1.el6.centos.x86_64.rpm

Source:
dea7ceb00bc57fb4c1ff6e8d7f6d9e3acc6852d4d4b29355d2bb1de300452532 thunderbird-45.5.0-1.el6.centos.src.rpm