A NULL pointer deference in the Digest authentication support in neon versions 0.28.0 through 0.28.2 inclusive allows a malicious server to crash a client application, resulting in possible denial of service. Reference: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=476571 0.26 seems unaffected, CVE is requested on oss-security.
Client crashes are not subject to Vulnerability Treatment Policy, but I'll bite that subversion might be used in automated setups.
net-misc/neon-0.28.3 was released on 2008-08-20. It fixes CVE-2008-3746.
0.28.3 in cvs, 0.26.4 does not seem to be affected
thanks, closing.