What is CVE-2015-8387?

CVE-2015-8387 is a high-severity vulnerability in Pcre Perl Compatible Regular Expression Library, classified under Integer Overflow or Wraparound. CVSS score: 7.3/10. Published 2015-12-02.

How severe is CVE-2015-8387?

High severity. CVSS v3 base score is 7.3 out of 10.

Is CVE-2015-8387 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Pcre Perl Compatible Regular Expression Library

CVE-2015-8387

PCRE before 8.38 mishandles (?123) subroutine calls and related subroutine calls, which allows remote attackers to cause a denial of service (integer overflow) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.

Vulnerability class: Integer Overflow

Published 2015-12-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.036 (89.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.036 · newest: 0.036 · change: 0.000

Affected products

Pcre Perl Compatible Regular Expression Library
PHP
Fedoraproject Fedora — versions 22

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

References

www.openwall.com/lists/oss-security/2015/11/29/1 (mailing-list, Mailing List, Third Party Advisory)
www.securityfocus.com/bid/82990 (VDB Entry, Third Party Advisory, vdb-entry)
lists.fedoraproject.org/pipermail/package-announce/2016-January/174931.html (vendor-advisory, Third Party Advisory)
h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay (Third Party Advisory)
bto.bluecoat.com/security-advisory/sa128 (Third Party Advisory)
vcs.pcre.org/pcre/code/trunk/ChangeLog (Release Notes, Broken Link)
security.gentoo.org/glsa/201607-02 (vendor-advisory, Third Party Advisory)
security.netapp.com/advisory/ntap-20230216-0002/

Frequently asked questions

What is CVE-2015-8387?: CVE-2015-8387 is a high-severity vulnerability in Pcre Perl Compatible Regular Expression Library, classified under Integer Overflow or Wraparound. CVSS score: 7.3/10. Published 2015-12-02.
How severe is CVE-2015-8387?: High severity. CVSS v3 base score is 7.3 out of 10.
Is CVE-2015-8387 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.