An RPM security update has been released for CentOS 5 and 6:

CESA-2014:1974 Important CentOS 5 rpm Security Update
CESA-2014:1974 Important CentOS 6 rpm Security Update

CESA-2014:1974 Important CentOS 5 rpm Security Update

CentOS Errata and Security Advisory 2014:1974 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2014-1974.html

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

i386:
ce90ffc946e163665a6e234ba7862b5df26fb2f4400302a21474ec8f81d1c51d popt-1.10.2.3-36.el5_11.i386.rpm
4e4ea91fe232ccbbcb086b34e69f0143808bf413395fd250053d8beaefe85808 rpm-4.4.2.3-36.el5_11.i386.rpm
5c497c44d5aac32100609370687ead0884104493984a9be3a5196d8412ea069a rpm-apidocs-4.4.2.3-36.el5_11.i386.rpm
a2f6f9a12e5fab40ed4c3e70702a19c6fbee93af4a306d5506e381061124ceb0 rpm-build-4.4.2.3-36.el5_11.i386.rpm
08c335b4bab7f770935acf9c608bee48b99ce77f3ad47dbd404055251d05f7b5 rpm-devel-4.4.2.3-36.el5_11.i386.rpm
1d582cbae6a5e47538162f83a3618dbfdb1f62be744277469db5d1e8cf049c45 rpm-libs-4.4.2.3-36.el5_11.i386.rpm
36100d57ff3ffe7d2e0af6a6fb74a878ee93e3a1307afebfda991065637e5b34 rpm-python-4.4.2.3-36.el5_11.i386.rpm

x86_64:
ce90ffc946e163665a6e234ba7862b5df26fb2f4400302a21474ec8f81d1c51d popt-1.10.2.3-36.el5_11.i386.rpm
75d77f9593154d99c970c16839c9aab58fc6f685612a5fd98b899130b6ec08ff popt-1.10.2.3-36.el5_11.x86_64.rpm
749dc82cf33d9c09554836efc2dc2a2f696afcf75ec2fa52fa9e41ebbf66e3af rpm-4.4.2.3-36.el5_11.x86_64.rpm
d02ab2431c2ede90c72f5bc0712afd9ae41506b23a4e6400646770d3951de71a rpm-apidocs-4.4.2.3-36.el5_11.x86_64.rpm
65e931a906bda36df7f3c4036d35815f90abdef1060c6abf487da6701ce47b62 rpm-build-4.4.2.3-36.el5_11.x86_64.rpm
08c335b4bab7f770935acf9c608bee48b99ce77f3ad47dbd404055251d05f7b5 rpm-devel-4.4.2.3-36.el5_11.i386.rpm
ac1dfc7031d0b467166a42c2c0eafb0161c3b4ad77f33b559470e3ebffe122ca rpm-devel-4.4.2.3-36.el5_11.x86_64.rpm
1d582cbae6a5e47538162f83a3618dbfdb1f62be744277469db5d1e8cf049c45 rpm-libs-4.4.2.3-36.el5_11.i386.rpm
1945aafd9ac9a48e11333e897a12dfc027e7a2f580daecf07d7fec45af99baaa rpm-libs-4.4.2.3-36.el5_11.x86_64.rpm
2cd8de634c4af1a8eaff87f78e5c0d0846531ac3d2ae28fd995c4750663e34cf rpm-python-4.4.2.3-36.el5_11.x86_64.rpm

Source:
588ac7a975477fd21d1d21a305b1d3b4947b8d0fbb98b16c083bdd355891e6ef rpm-4.4.2.3-36.el5_11.src.rpm

CESA-2014:1974 Important CentOS 6 rpm Security Update

CentOS Errata and Security Advisory 2014:1974 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2014-1974.html

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

i386:
52fa7b2f13b6a62977fd5224c283cb0b034e2b16f71d3554427572cb41e6b8ec rpm-4.8.0-38.el6_6.i686.rpm
1a90f70c8211ce3e19221df2587161a4a0c59c657cba520bdb88db6cface5cee rpm-apidocs-4.8.0-38.el6_6.noarch.rpm
504cebc256639051a9ef8a30883aa52c5865a7316d75148a6b2be0c1a4a54767 rpm-build-4.8.0-38.el6_6.i686.rpm
17edf0003b4d8438aacacb70cefca3872bb4175ba1253baad791db2bd0b978e8 rpm-cron-4.8.0-38.el6_6.noarch.rpm
82297ab09d50bab338efedadb3bd37867afa20eaa1066433ce04c75226e61610 rpm-devel-4.8.0-38.el6_6.i686.rpm
78e470176542ae0800ebbd95deee0bb03249eb6acb3a71c8bfbf95cbb9b9b023 rpm-libs-4.8.0-38.el6_6.i686.rpm
3c215b17af81d2b89bd8100a48bf02416cf9dd89827dc486740748b802c4ca98 rpm-python-4.8.0-38.el6_6.i686.rpm

x86_64:
d05aa70a5c7c2f61f12c0b0459422bac941d967176bc80d5593820f56b6aa962 rpm-4.8.0-38.el6_6.x86_64.rpm
1a90f70c8211ce3e19221df2587161a4a0c59c657cba520bdb88db6cface5cee rpm-apidocs-4.8.0-38.el6_6.noarch.rpm
bc5fb9ac7bdf354a69776def22370ee3cd20e2d66dda5f0f5c4a0ac6328abc1e rpm-build-4.8.0-38.el6_6.x86_64.rpm
17edf0003b4d8438aacacb70cefca3872bb4175ba1253baad791db2bd0b978e8 rpm-cron-4.8.0-38.el6_6.noarch.rpm
82297ab09d50bab338efedadb3bd37867afa20eaa1066433ce04c75226e61610 rpm-devel-4.8.0-38.el6_6.i686.rpm
a78d256d435df57e9e36cfa03f8b1c03b1d68581cd8935f7923dec0d2f71562a rpm-devel-4.8.0-38.el6_6.x86_64.rpm
78e470176542ae0800ebbd95deee0bb03249eb6acb3a71c8bfbf95cbb9b9b023 rpm-libs-4.8.0-38.el6_6.i686.rpm
e5994327fe5828dec70621eb906357a800a303afb599e68ac0ecd0a3046dfb0a rpm-libs-4.8.0-38.el6_6.x86_64.rpm
419c4c4e7969b163717e67aa725d0ff94a1a998510e4181241597b6b21732035 rpm-python-4.8.0-38.el6_6.x86_64.rpm

Source:
62b50a40fdd732520474ab18bf9a9c1a04c56edf88d0f7956f662e8678353cc9 rpm-4.8.0-38.el6_6.src.rpm