CVE-2015-2326

Name: CVE-2015-2326
Creator: NVD / NIST
Published: 2020-01-14T17:15:12.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.59%

Last modified Jun 17, 2026

CVE-2015-2326 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. The pcre_compile2 function in PCRE before 8.37 allows context-dependent attackers to compile incorrect code and cause a denial of service (out-of-bounds read) via regular expression with a group containing both a forward referencing subroutine call and a recursive back reference, as demonstrated by "((?+1)(\1))/".. EPSS estimates a 1.59% chance of exploitation in the next 30 days.

Description

The pcre_compile2 function in PCRE before 8.37 allows context-dependent attackers to compile incorrect code and cause a denial of service (out-of-bounds read) via regular expression with a group containing both a forward referencing subroutine call and a recursive back reference, as demonstrated by "((?+1)(\1))/".

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

1.59%

72.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Pcre	Pcre	< 8.37
Opensuse	Opensuse	13.1
Opensuse	Opensuse	13.2
Mariadb	Mariadb	>= 10.0.0, < 10.0.18
Php	Php	>= 5.4.0, < 5.4.41
Php	Php	>= 5.5.0, < 5.5.26
Php	Php	>= 5.6.0, < 5.6.9

References

http://lists.opensuse.org/opensuse-updates/2015-05/msg00014.htmlMailing List, Third Party Advisory
https://bugs.exim.org/show_bug.cgi?id=1592Exploit, Issue Tracking, Permissions Required, Third Party Advisory
https://fortiguard.com/zeroday/FG-VD-15-016Third Party Advisory
https://www.pcre.org/original/changelog.txtRelease Notes, Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2015-05/msg00014.htmlMailing List, Third Party Advisory
https://bugs.exim.org/show_bug.cgi?id=1592Exploit, Issue Tracking, Permissions Required, Third Party Advisory
https://fortiguard.com/zeroday/FG-VD-15-016Third Party Advisory
https://www.pcre.org/original/changelog.txtRelease Notes, Third Party Advisory

Timeline

Published: Jan 14, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-2326?

How severe is CVE-2015-2326?

CVE-2015-2326 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.59% probability of exploitation in the next 30 days.

How do I fix CVE-2015-2326?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-2326?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST