One security issue has been found in HAProxy, a load-balancing reverse
proxy:

CVE-2013-2175

    Denial of service in parsing HTTP headers.

For the backports for the oldstable distribution
(squeeze-backports-sloppy), the problem has been fixed in version
1.4.24-1~bpo60+1.

For the backports for the stable distribution (wheezy-backports), the
problem has been fixed in version 1.4.24-1~bpo70+1.

For the oldstable distribution (squeeze), the problem has been fixed in
version 1.4.8-1+squeeze1. See DSA 2711-1.

The stable distribution (wheezy) doesn't contain haproxy.

For the unstable distribution (sid), the problem has been fixed in
version 1.4.24-1. See DSA 2711-1.

We recommend that you upgrade your haproxy packages.