pcre: infinite recursion compiling pattern with zero-repeated groups that include recursive back reference (8.36/19)
Published Dec 2, 2015
7.5
HIGHCVSS 2.0
EPSS 4.05%
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.
Affected products
No data.
- ≤ 8.35
No data.
Red Hat Enterprise Linux 7
pcre-0:8.32-15.el7
Fixed · RHBA-2015:2142
Red Hat Software Collections for Red Hat Enterprise Linux 6
rh-php56-0:2.3-1.el6
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 6
rh-php56-php-0:5.6.25-1.el6
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 6
rh-php56-php-pear-1:1.9.5-4.el6
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
rh-php56-0:2.3-1.el6
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
rh-php56-php-0:5.6.25-1.el6
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
rh-php56-php-pear-1:1.9.5-4.el6
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7
rh-php56-0:2.3-1.el7
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7
rh-php56-php-0:5.6.25-1.el7
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7
rh-php56-php-pear-1:1.9.5-4.el7
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS
rh-php56-0:2.3-1.el7
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS
rh-php56-php-0:5.6.25-1.el7
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS
rh-php56-php-pear-1:1.9.5-4.el7
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
rh-php56-0:2.3-1.el7
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
rh-php56-php-0:5.6.25-1.el7
Fixed · RHSA-2016:2750
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
rh-php56-php-pear-1:1.9.5-4.el7
Fixed · RHSA-2016:2750
Red Hat Directory Server 8
pcre
Not affected
Red Hat Enterprise Linux 5
pcre
Not affected
Red Hat Enterprise Linux 6
glib2
Will not fix
Red Hat Enterprise Linux 6
pcre
Not affected
Red Hat Enterprise Linux 7
glib2
Will not fix
Red Hat Enterprise Linux 7
virtuoso-opensource
Not affected
Red Hat JBoss Enterprise Web Server 1
httpd
Not affected
Red Hat JBoss Enterprise Web Server 2
httpd
Not affected
Red Hat JBoss Enterprise Web Server 3
pcre
Will not fix
Red Hat Software Collections
php54-php
Will not fix
Red Hat Software Collections
php55-php
Will not fix
Red Hat Software Collections
rh-mariadb100-mariadb
Not affected
Red Hat Software Collections
rh-mariadb101-mariadb
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | pcre-0:8.32-15.el7 | Fixed | RHBA-2015:2142 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | rh-php56-0:2.3-1.el6 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | rh-php56-php-0:5.6.25-1.el6 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | rh-php56-php-pear-1:1.9.5-4.el6 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS | rh-php56-0:2.3-1.el6 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS | rh-php56-php-0:5.6.25-1.el6 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS | rh-php56-php-pear-1:1.9.5-4.el6 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | rh-php56-0:2.3-1.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | rh-php56-php-0:5.6.25-1.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | rh-php56-php-pear-1:1.9.5-4.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS | rh-php56-0:2.3-1.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS | rh-php56-php-0:5.6.25-1.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS | rh-php56-php-pear-1:1.9.5-4.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS | rh-php56-0:2.3-1.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS | rh-php56-php-0:5.6.25-1.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS | rh-php56-php-pear-1:1.9.5-4.el7 | Fixed | RHSA-2016:2750 |
| Red Hat Directory Server 8 | pcre | Not affected | n/a |
| Red Hat Enterprise Linux 5 | pcre | Not affected | n/a |
| Red Hat Enterprise Linux 6 | glib2 | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | pcre | Not affected | n/a |
| Red Hat Enterprise Linux 7 | glib2 | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | virtuoso-opensource | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 1 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 3 | pcre | Will not fix | n/a |
| Red Hat Software Collections | php54-php | Will not fix | n/a |
| Red Hat Software Collections | php55-php | Will not fix | n/a |
| Red Hat Software Collections | rh-mariadb100-mariadb | Not affected | n/a |
| Red Hat Software Collections | rh-mariadb101-mariadb | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.05% (0.04049) | 90.32th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.05% (0.04049) | 89.28th | v5 (v2026.06.15) |
| Mar 23, 2026 | 2.82% (0.02821) | 86.02th | v4 (v2025.03.14) |
| Jul 11, 2025 | 4.53% (0.04530) | 88.67th | v4 (v2025.03.14) |
| May 17, 2025 | 6.03% (0.06026) | 90.19th | v4 (v2025.03.14) |
| May 6, 2025 | 4.31% (0.04313) | 88.23th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.78% (0.02782) | 84.79th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.87% (0.04867) | 82.20th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.73% (0.03731) | 87.21th | v4 (v2025.03.14) |
| Dec 17, 2024 | 30.57% (0.30568) | 96.95th | v3 (v2023.03.01) |
| May 13, 2023 | 5.90% (0.05897) | 92.29th | v3 (v2023.03.01) |
| Mar 7, 2023 | 6.48% (0.06478) | 92.57th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (11)
- http://rhn.redhat.com/errata/RHSA-2016-2750.html vendor-advisoryx_refsource_REDHAT
- http://vcs.pcre.org/pcre/code/trunk/ChangeLog?view=markup x_refsource_CONFIRMExploit
- http://www.fortiguard.com/advisory/FG-VD-15-010/ x_refsource_MISC
- http://www.openwall.com/lists/oss-security/2015/11/29/1 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/74924 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2015-2327 Vendor Advisory
- https://bugs.exim.org/show_bug.cgi?id=1503 x_refsource_CONFIRMExploit
- https://bugzilla.redhat.com/show_bug.cgi?id=1285408 Issue Tracking
- https://jira.mongodb.org/browse/SERVER-17252 x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2015-2327
- https://www.cve.org/CVERecord?id=CVE-2015-2327
| Link | Providers | Tags |
|---|---|---|
| http://rhn.redhat.com/errata/RHSA-2016-2750.html | vendor-advisoryx_refsource_REDHAT | |
| http://vcs.pcre.org/pcre/code/trunk/ChangeLog?view=markup | x_refsource_CONFIRMExploit | |
| http://www.fortiguard.com/advisory/FG-VD-15-010/ | x_refsource_MISC | |
| http://www.openwall.com/lists/oss-security/2015/11/29/1 | mailing-listx_refsource_MLIST | |
| http://www.securityfocus.com/bid/74924 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2015-2327 | Vendor Advisory | |
| https://bugs.exim.org/show_bug.cgi?id=1503 | x_refsource_CONFIRMExploit | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1285408 | Issue Tracking | |
| https://jira.mongodb.org/browse/SERVER-17252 | x_refsource_CONFIRM | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-2327 | ||
| https://www.cve.org/CVERecord?id=CVE-2015-2327 |
Change history (0)
No recorded changes yet.