CVE-2015-2327

critical

Description

PCRE before 8.36 mishandles the /(((a\2)|(a*)\g<-1>))*/ pattern and related patterns with certain internal recursive back references, which allows remote attackers to cause a denial of service (segmentation fault) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.

References

https://jira.mongodb.org/browse/SERVER-17252

https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-2420

https://bugs.exim.org/show_bug.cgi?id=1503

http://www.securityfocus.com/bid/74924

http://www.openwall.com/lists/oss-security/2015/11/29/1

http://www.fortiguard.com/advisory/FG-VD-15-010/

http://vcs.pcre.org/pcre/code/trunk/ChangeLog?view=markup

http://rhn.redhat.com/errata/RHSA-2016-2750.html

Details

Source: Mitre, NVD

Published: 2015-12-02

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.04049