Debian Linux Security Advisory 2519-2 - It was discovered that the recent update for isc-dhcp, did not contain the patched code included in the source package. Due to quirk in the build system those patches were deapplied during the build process.
56cde2d842365388e86b4e3822e43e10f8a15d275662e2a0613a84e1fe731f1c