Updated apr and procmail packages has been released for CentOS:

CESA-2017:3269 Important CentOS 7 procmail Security Update
CESA-2017:3270 Important CentOS 6 apr Security Update
CESA-2017:3270 Important CentOS 7 apr Security Update

CESA-2017:3269 Important CentOS 7 procmail Security Update

CentOS Errata and Security Advisory 2017:3269 Important

Upstream details at : https://access.redhat.com/errata/RHSA-2017:3269

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

x86_64:
4e789cc8cfc479b020b1977b28f46ae8a0ad75ded87505b170a045fb8cc84940 procmail-3.22-36.el7_4.1.x86_64.rpm

Source:
e8ee557c75d2725eeca4c67d9b59a58e55f3bdd4e56713dc0e32aa365d2f0117 procmail-3.22-36.el7_4.1.src.rpm

CESA-2017:3270 Important CentOS 6 apr Security Update

CentOS Errata and Security Advisory 2017:3270 Important

Upstream details at : https://access.redhat.com/errata/RHSA-2017:3270

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

i386:
f43725ed8ac01193b5ffc66369caaed7e8b1bcaeff24e0c8fcf92a36a868f227 apr-1.3.9-5.el6_9.1.i686.rpm
1a0b7a2ea85f3c4aebe8831fca8058ebc002122d8502fca42e7b39858d916faf apr-devel-1.3.9-5.el6_9.1.i686.rpm

x86_64:
f43725ed8ac01193b5ffc66369caaed7e8b1bcaeff24e0c8fcf92a36a868f227 apr-1.3.9-5.el6_9.1.i686.rpm
85a772c6b36978427577f740a9597d7c2bb3e90e5ad1752c3f65cfa2657a9ee7 apr-1.3.9-5.el6_9.1.x86_64.rpm
1a0b7a2ea85f3c4aebe8831fca8058ebc002122d8502fca42e7b39858d916faf apr-devel-1.3.9-5.el6_9.1.i686.rpm
a86fe286455773b17644990de88e5c8cf9400d6dbcb39af0823d8e99cbb92026 apr-devel-1.3.9-5.el6_9.1.x86_64.rpm

Source:
17e84de76c7f30bb574389344dda75b04aad703e40a71342ebf271d33c424551 apr-1.3.9-5.el6_9.1.src.rpm

CESA-2017:3270 Important CentOS 7 apr Security Update

CentOS Errata and Security Advisory 2017:3270 Important

Upstream details at : https://access.redhat.com/errata/RHSA-2017:3270

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

x86_64:
ef45657b829290b4b95e2b387cef4b12ccdd6daf6f843a89f8ae1de35b778f5f apr-1.4.8-3.el7_4.1.i686.rpm
9e2e5ff3d7cf302ac80e00f5ffaf05396cd9843c9f9aaeccc19b18e10a9055d3 apr-1.4.8-3.el7_4.1.x86_64.rpm
102f40285f4c4294b2dc5195abbaffacb72a8ebdcd54db19b363134643daaa3f apr-devel-1.4.8-3.el7_4.1.i686.rpm
dbdcebf6643326fd04a60d3392756642f2e1215ee9d5609e09721286454da551 apr-devel-1.4.8-3.el7_4.1.x86_64.rpm

Source:
e1d7eecf968f001d7e125582bc8dc6467e7de98b1eeb1cf7d80e42a834131c05 apr-1.4.8-3.el7_4.1.src.rpm