Bug 1126695 - llvm: resource consumption issue in C++ regex library
Summary: llvm: resource consumption issue in C++ regex library
Alias: None
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Whiteboard: impact=low,public=20140713,reported=2...
Depends On: 1126696 1126697 1126698 1126699
TreeView+ depends on / blocked
Reported: 2014-08-05 05:42 UTC by Murray McAllister
Modified: 2019-06-08 20:08 UTC (History)
10 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2014-08-12 03:52:48 UTC

Attachments (Terms of Use)

Description Murray McAllister 2014-08-05 05:42:47 UTC
Maksymilian Arciemowicz reported a resource consumption issue in the libcxx C++ regex library. If an attacker were able to make an application using this library process a specially-crafted regular expression, it could cause the application to consume excessive system resources.

Original report:


Upstream bug:


A patch is not yet available. Currently on Fedora, this requires compiling the affected program with the experimental ISO C++ 2011 support by using the "-std=c++11" option.

Comment 1 Murray McAllister 2014-08-05 05:43:59 UTC
Created llvm tracking bugs for this issue:

Affects: fedora-all [bug 1126696]
Affects: epel-6 [bug 1126698]
Affects: epel-7 [bug 1126699]

Comment 2 Murray McAllister 2014-08-05 05:44:03 UTC
Created mingw-llvm tracking bugs for this issue:

Affects: fedora-all [bug 1126697]

Comment 3 Murray McAllister 2014-08-05 05:51:38 UTC
CVE request: http://www.openwall.com/lists/oss-security/2014/08/05/4

Comment 4 Dave Johansen 2014-08-05 14:36:16 UTC
Does this only apply to libcxx and not libstdc++? Because libstdc++ is used and not libcxx on EPEL 6/7 (and also on Fedora I believe).

Comment 5 Murray McAllister 2014-08-07 07:54:15 UTC
Sorry for the confusion (and spam). I think it may only be libcxx

Comment 6 Jonathan Wakely 2014-08-07 09:27:11 UTC
This is not relevant to RHEL or Fedora, libc++ issues don't belong here.

Comment 7 Dave Johansen 2014-08-12 03:52:48 UTC
libstdc++ is used and not libc++ so this issue does not effect RHEL/Fedora.

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