In the GNU C Library (aka glibc or libc6) before 2.28, parse_reg_exp in posix/regcomp.c misparses alternatives, which allows attackers to cause a denial of service (assertion failure and application exit) or trigger an incorrect result by attempting a regular-expression match.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eb04c21373e2a2885f3d52ff192b0499afe3c672
https://sourceware.org/bugzilla/show_bug.cgi?id=18986
https://sourceware.org/bugzilla/show_bug.cgi?id=11053
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793
http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272
https://security.netapp.com/advisory/ntap-20190315-0002/
https://support.f5.com/csp/article/K64119434
https://support.f5.com/csp/article/K64119434?utm_source=f5support&utm_medium=RSS
https://lists.apache.org/thread.html/[email protected]%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/[email protected]%3Cissues.bookkeeper.apache.org%3E
Source: MITRE
Published: 2019-02-26
Updated: 2021-06-29
Type: CWE-19
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH