CRLF injection vulnerability in the FILTER_VALIDATE_EMAIL filter in ext/filter in PHP 5.2.0 and 5.2.1 allows context-dependent attackers to inject arbitrary e-mail headers via an e-mail address with a '\n' character, which causes a regular expression to ignore the subsequent part of the address string.
https://www.redhat.com/archives/fedora-package-announce/2007-September/msg00397.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6067
https://exchange.xforce.ibmcloud.com/vulnerabilities/33510
http://www.vupen.com/english/advisories/2007/3386
http://www.vupen.com/english/advisories/2007/2016
http://www.ubuntu.com/usn/usn-455-1
http://www.trustix.org/errata/2007/0023/
http://www.securityfocus.com/bid/23359
http://www.php.net/releases/5_2_3.php
http://www.php-security.org/MOPB/PMOPB-45-2007.html
http://www.novell.com/linux/security/advisories/2007_32_php.html
http://www.gentoo.org/security/en/glsa/glsa-200710-02.xml
http://www.debian.org/security/2007/dsa-1283
http://slackware.com/security/viewer.php?l=slackware-security&y=2007&m=slackware-security.482863
http://security.gentoo.org/glsa/glsa-200705-19.xml
http://secunia.com/advisories/27110
http://secunia.com/advisories/27102
http://secunia.com/advisories/27037
http://secunia.com/advisories/26231
http://secunia.com/advisories/25535
http://secunia.com/advisories/25445
http://secunia.com/advisories/25062
http://secunia.com/advisories/25057
http://secunia.com/advisories/25056
http://secunia.com/advisories/24824
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01178795