CVE-2015-8391: Fedoraproject Fedora

Critical severity, CVSS 9.8. EPSS: 6.4% chance of exploitation in the next 30 days.

The pcre_compile function in pcre_compile.c in PCRE before 8.38 mishandles certain [: nesting, which allows remote attackers to cause a denial of service (CPU consumption) or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a JavaScript RegExp object encountered by Konqueror.

Affected products

• Fedoraproject Fedora: version 22 only
• Oracle Linux: version 7 only
• Pcre Pcre: before 8.38 (fixed in 8.38)
• PHP PHP: from 5.5.0, before 5.5.32 (fixed in 5.5.32); from 5.6.0, before 5.6.18 (fixed in 5.6.18); from 7.0.0, before 7.0.3 (fixed in 7.0.3)
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Eus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.5 only; version 7.6 only; version 7.7 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.6 only; version 7.7 only
• Red Hat Enterprise Linux Server Tus: version 7.2 only; version 7.3 only; version 7.6 only; version 7.7 only
• Red Hat Enterprise Linux Workstation: version 7.0 only

Published 2015-12-02. Last modified 2026-06-17.