A ruby-rack security update has been released for Debian

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Debian Security Advisory DSA-3322-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
July 31, 2015 https://www.debian.org/security/faq
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Package : ruby-rack
CVE ID : CVE-2015-3225
Debian Bug : 789311

Tomek Rabczak from the NCC Group discovered a flaw in the
normalize_params() method in Rack, a modular Ruby webserver interface.
A remote attacker can use this flaw via specially crafted requests to
cause a `SystemStackError` and potentially cause a denial of service
condition for the service.

For the oldstable distribution (wheezy), this problem has been fixed
in version 1.4.1-2.1+deb7u1.

For the stable distribution (jessie), this problem has been fixed in
version 1.5.2-3+deb8u1.

For the unstable distribution (sid), this problem has been fixed in
version 1.5.2-4.

We recommend that you upgrade your ruby-rack packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/