request.c in lighttpd 1.4.15 allows remote attackers to cause a denial of service (daemon crash) by sending an HTTP request with duplicate headers, as demonstrated by a request containing two Location header lines, which results in a segmentation fault.
http://www.vupen.com/english/advisories/2007/2585
http://www.securityfocus.com/bid/24967
http://www.securityfocus.com/archive/1/474131/100/0/threaded
http://www.novell.com/linux/security/advisories/2007_15_sr.html
http://www.debian.org/security/2007/dsa-1362
http://trac.lighttpd.net/trac/ticket/1232
http://trac.lighttpd.net/trac/changeset/1869
http://security.gentoo.org/glsa/glsa-200708-11.xml
http://secunia.com/advisories/26593
http://secunia.com/advisories/26505
http://secunia.com/advisories/26158