How severe is CVE-2015-8394?

CVE-2015-8394 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-8394 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-8394?

CVE-2015-8394 primarily affects Pcre Perl Compatible Regular Expression Library. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-8394?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2015-8394 published?

CVE-2015-8394 was published on 2015-12-02 and last updated on 2026-06-17.

CVE-2015-8394

CVE-2015-8394 is a critical-severity vulnerability in Pcre Perl Compatible Regular Expression Library with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Pcre Perl Compatible Regular Expression Library
Published: 2015-12-02
Last modified: 2026-06-17

Description

PCRE before 8.38 mishandles the (?(<digits>) and (?(R<digits>) conditions, 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.

Frequently asked questions

What is CVE-2015-8394?: PCRE before 8.38 mishandles the (?(<digits>) and (?(R<digits>) conditions, 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.
How severe is CVE-2015-8394?: CVE-2015-8394 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-8394 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8394?: CVE-2015-8394 primarily affects Pcre Perl Compatible Regular Expression Library. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-8394?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2015-8394 published?: CVE-2015-8394 was published on 2015-12-02 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:pcre:perl_compatible_regular_expression_library:*:*:*:*:*:*:*:*
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

More vulnerabilities in Pcre Perl Compatible Regular Expression Library

CVE-2015-8390 — Critical (CVSS 9.8): PCRE before 8.38 mishandles the [: and \\ substrings in character classes, which allows remote attackers to cause a…
CVE-2015-8389 — Critical (CVSS 9.8): PCRE before 8.38 mishandles the /(?:|a|){100}x/ pattern and related patterns, which allows remote attackers to cause a…
CVE-2015-8386 — Critical (CVSS 9.8): PCRE before 8.38 mishandles the interaction of lookbehind assertions and mutually recursive subpatterns, which allows…
CVE-2015-8383 — Critical (CVSS 9.8): PCRE before 8.38 mishandles certain repeated conditional groups, which allows remote attackers to cause a denial of…
CVE-2015-8395 — High (CVSS 7.5): PCRE before 8.38 mishandles certain references, which allows remote attackers to cause a denial of service or possibly…
CVE-2015-8393 — High (CVSS 7.5): pcregrep in PCRE before 8.38 mishandles the -q option for binary files, which might allow remote attackers to obtain…

All CVEs affecting Pcre Perl Compatible Regular Expression Library →

Other CWE-190 (Integer Overflow or Wraparound) vulnerabilities

CVE-2026-4689 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was…
CVE-2026-24814 — Critical (CVSS 10.0): Integer Overflow or Wraparound vulnerability in swoole swoole-src (thirdparty/hiredis modules). This vulnerability is…
CVE-2025-64721 — Critical (CVSS 10.0): Sandboxie is a sandbox-based isolation software for 32-bit and 64-bit Windows NT-based operating systems. In versions…
CVE-2015-5108 — Critical (CVSS 10.0): Integer overflow in Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC…
CVE-2015-5097 — Critical (CVSS 10.0): Integer overflow in Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC…
CVE-2013-2555 — Critical (CVSS 10.0): Integer overflow in Adobe Flash Player before 10.3.183.75 and 11.x before 11.7.700.169 on Windows and Mac OS X, before…

Browse all CWE-190 (Integer Overflow or Wraparound) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

183.182.99.92 (ipv4-addr)
103.153.190.105 (ipv4-addr)
188.44.20.32 (ipv4-addr)
198.199.94.79 (ipv4-addr)
122.3.106.113 (ipv4-addr)