Buffer underflow in src/http/ngx_http_parse.c in nginx 0.1.0 through 0.5.37, 0.6.x before 0.6.39, 0.7.x before 0.7.62, and 0.8.x before 0.8.15 allows remote attackers to execute arbitrary code via crafted HTTP requests.
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00449.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00442.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00428.html
http://www.kb.cert.org/vuls/id/180065