The ap_get_mime_headers_core function in Apache httpd 2.0.49 allows remote attackers to cause a denial of service (memory exhaustion), and possibly an integer signedness error leading to a heap-based buffer overflow on 64 bit systems, via long header lines with large numbers of space or tab characters.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10605
https://exchange.xforce.ibmcloud.com/vulnerabilities/16524
http://www.trustix.org/errata/2004/0039/
http://www.redhat.com/support/errata/RHSA-2004-342.html
http://www.mandriva.com/security/advisories?name=MDKSA-2004:064
http://www.guninski.com/httpd1.html
http://www.apacheweek.com/features/security-20
http://security.gentoo.org/glsa/glsa-200407-03.xml
http://marc.info/?l=bugtraq&m=109181600614477&w=2
http://marc.info/?l=bugtraq&m=108853066800184&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2004-June/023133.html