An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. A number of heap-based buffer over-read instances are present in mbstring regular expression functions when supplied with invalid multibyte data. These occur in ext/mbstring/oniguruma/regcomp.c, ext/mbstring/oniguruma/regexec.c, ext/mbstring/oniguruma/regparse.c, ext/mbstring/oniguruma/enc/unicode.c, and ext/mbstring/oniguruma/src/utf32_be.c when a multibyte regular expression pattern contains invalid multibyte sequences.
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00083.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00104.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00041.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00044.html
http://www.securityfocus.com/bid/107156
https://access.redhat.com/errata/RHSA-2019:2519
https://access.redhat.com/errata/RHSA-2019:3299
https://bugs.php.net/bug.php?id=77370
https://bugs.php.net/bug.php?id=77371
https://bugs.php.net/bug.php?id=77381
https://bugs.php.net/bug.php?id=77382
https://bugs.php.net/bug.php?id=77385
https://bugs.php.net/bug.php?id=77394
https://bugs.php.net/bug.php?id=77418
https://security.netapp.com/advisory/ntap-20190321-0001/
https://support.f5.com/csp/article/K06372014
https://usn.ubuntu.com/3902-1/
Source: MITRE
Published: 2019-02-22
Updated: 2019-06-18
Type: CWE-125
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL