CVE-2007-1661
MEDIUMEPSS 83th pctlDescription
Perl-Compatible Regular Expression (PCRE) library before 7.3 backtracks too far when matching certain input bytes against some regex patterns in non-UTF-8 mode, which allows context-dependent attackers to obtain sensitive information or cause a denial of service (crash), as demonstrated by the "\X?\d" and "\P{L}?\d" patterns.
How to fix
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v2 Vector
No CVSS vector data available.
Exploit Intelligence
Elevated risk: more likely to be exploited than 83% of all known CVEs.
References
- bugs.gentoo.org
- docs.info.apple.com
- docs.info.apple.com
- lists.apple.com
- lists.apple.com
- mail.gnome.org
- security.gentoo.org
- security.gentoo.org
- security.gentoo.org
- security.gentoo.org
- security.gentoo.org
- debian.org
- mandriva.com
- novell.com
- pcre.org
- securityfocus.com
- securityfocus.com
- securityfocus.com
- vupen.com
- vupen.com
- vupen.com
- vupen.com
- exchange.xforce.ibmcloud.com
- issues.rpath.com
- usn.ubuntu.com
- redhat.com
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Start freeThis product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.