CVE-2015-8386

30

FAUCET Score

CVE-2015-8386 describes a critical buffer overflow vulnerability in PCRE versions prior to 8.38, impacting products like Fedora, Oracle, and PHP. This flaw arises from improper handling of lookbehind assertions and recursive subpatterns in regular expressions, allowing remote attackers to trigger a denial of service or potentially other unspecified impacts. With a CVSS score of 9.8 (Critical), it presents a high-impact, low-complexity attack vector, though there is no evidence of active exploitation, public exploit code, or significant community discussion.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		<= 8.37CPE matchmatch criteria	cpe:2.3:a:pcre:perl_compatible_regular_expression_library::::::::
		22CPE matchmatch criteria	cpe:2.3:o:fedoraproject:fedora:22:::::::*
		7CPE matchmatch criteria	cpe:2.3:o:oracle:linux:7:::::::*
		>= 5.5.0, < 5.5.32CPE matchmatch criteria	cpe:2.3:a:php:php::::::::
		>= 5.6.0, < 5.6.18CPE matchmatch criteria	cpe:2.3:a:php:php::::::::

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

3.9

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

7.06%

Probability of exploitation in next 30 days

EPSS Percentile

93.5%

Percentile rank of EPSS score among Peer Group

As of 2026-07-25

Model: v2026.06.15

This CVE's current EPSS score of 0.0706 is in the 89th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (33)

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: pcre-0:8.32-15.el7_2.1

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-mariadb100-mariadb-1:10.0.25-4.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-php56-0:2.3-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-php56-php-0:5.6.25-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-php56-php-pear-1:1.9.5-4.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUSFixed in: rh-mariadb100-mariadb-1:10.0.25-4.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-mariadb100-mariadb-1:10.0.25-4.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-php56-0:2.3-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-php56-php-0:5.6.25-1.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-php56-php-pear-1:1.9.5-4.el6

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-mariadb100-mariadb-1:10.0.25-4.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-php56-0:2.3-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-php56-php-0:5.6.25-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-php56-php-pear-1:1.9.5-4.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUSFixed in: rh-mariadb100-mariadb-1:10.0.25-4.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUSFixed in: rh-mariadb100-mariadb-1:10.0.25-4.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUSFixed in: rh-php56-0:2.3-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUSFixed in: rh-php56-php-0:5.6.25-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUSFixed in: rh-php56-php-pear-1:1.9.5-4.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSFixed in: rh-php56-0:2.3-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSFixed in: rh-php56-php-0:5.6.25-1.el7

redhatpatch availablevia redhat_api

Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSFixed in: rh-php56-php-pear-1:1.9.5-4.el7

redhatend of lifevia redhat_api

Product: Red Hat Directory Server 8Fixed in: pcre

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 5Fixed in: pcre

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 6Fixed in: glib2

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 6Fixed in: pcre

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: glib2

redhatend of lifevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: virtuoso-opensource

redhatend of lifevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 1Fixed in: httpd

redhatend of lifevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 2Fixed in: httpd

redhatend of lifevia redhat_api

Product: Red Hat JBoss Enterprise Web Server 3Fixed in: pcre

redhatend of lifevia redhat_api

Product: Red Hat Software CollectionsFixed in: php54-php

redhatend of lifevia redhat_api

Product: Red Hat Software CollectionsFixed in: php55-php

Vendor Advisories (1)

redhatCVE-2015-8386Low

pcre: Buffer overflow caused by lookbehind assertion (8.38/6)

References

lists.fedoraproject.org / pipermail/package-announce/2016-January/174931.html

Third Party Advisory

rhn.redhat.com / errata/RHSA-2016-1025.html

Third Party Advisory

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

Third Party Advisory

access.redhat.com / errata/RHSA-2016:1132

Third Party Advisory

bto.bluecoat.com / security-advisory/sa128

Third Party Advisory

h20566.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay

Third Party Advisory

security.gentoo.org / glsa/201607-02

Third Party Advisory

security.netapp.com / advisory/ntap-20230216-0002

vcs.pcre.org / pcre/code/trunk/ChangeLog

Broken LinkRelease Notes

www-01.ibm.com / support/docview.wss

Third Party Advisory

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

Mailing ListThird Party Advisory

oracle.com / technetwork/topics/security/linuxbulletinapr2016-2952096.html

Third Party Advisory

securityfocus.com / bid/82990

Third Party AdvisoryVDB Entry