From debian bugzilla at $URL:
A remote attacker could provide a specially-crafted input, which once processed by an application, using the Python language API of ClearSilver neo_cgi module, could lead to that particular application crash, or, potentially arbitrary code
execution with the privileges of the user running the application.
There is a proposed patch:
Format string vulnerability in the p_cgi_error function in python/neo_cgi.c
in the Python CGI Kit (neo_cgi) module for Clearsilver 0.10.5 and earlier
allows remote attackers to cause a denial of service (crash) and possibly
execute arbitrary code via format string specifiers that are not properly
handled when creating CGI error messages using the cgi_error API function.
This is fixed upstream in http://code.google.com/p/clearsilver/source/detail?r=919 but there has been no release since then. Recommended to patch using the provided patch in comment 0 / upstream patch.
still no movement on a patch or release from upstream. candidate for tree cleaning with no rdeps.
# Aaron Bauman <email@example.com> (05 Mar 2016)
# Per security bug #392325 this package is vulnerable
# and unmaintained. Removal in 30 days.