Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | glibc | 2.28-1 | — |
| Debian 14 | gnulib | 20140202+stable-3.2 | — |
| Debian 13 | glibc | 2.28-1 | — |
| Debian 13 | gnulib | 20140202+stable-3.2 | — |
| Debian 12 | glibc | 2.28-1 | — |
| Debian 12 | gnulib | 20140202+stable-3.2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | gnulib | No fix yet | — |
| Ubuntu 16.04 LTS | glibc | 2.23-0ubuntu11.3 | USN-4954-1 |
| Ubuntu 16.04 LTS | gnulib | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | glibc | No fix yet | — |
| Ubuntu Pro 14.04 LTS | eglibc | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | glibc | 2.26-13.24.1 | SUSE-SU-2019:1877-1 |
| SLES 15 | glibc | 2.26-13.24.1 | SUSE-SU-2019:1877-1 |
| SLES 12 SP4 | glibc | 2.22-100.8.1 | SUSE-SU-2019:1102-1 |
| SLES 12 SP3 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-2, SUSE-SU-2019:1958-1 |
| SLES 12 SP2 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP4 | glibc | 2.22-100.8.1 | SUSE-SU-2019:1102-1 |
| SLES for SAP 12 SP3 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-1 |
| SLES for SAP 12 SP2 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-1 |
| SUSE OpenStack Cloud Crowbar 8 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-2 |
| SUSE OpenStack Cloud 8 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-1 |
| SUSE OpenStack Cloud 7 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-1 |
| SUSE HPE Helion OpenStack 8 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-2 |
| SUSE Enterprise Storage 5 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-2, SUSE-SU-2019:1958-1 |
| SUSE Enterprise Storage 4 | glibc | 2.22-62.22.5 | SUSE-SU-2019:1958-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.34-1.2 | openSUSE-SU-2024:10792-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | nscd +199 | 2.26-62.amzn2 | ALAS2-2022-1869 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | metis +1 | No fix yet | — |
Advisories 7
- USN-4954-1 glibc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2024:10792-1 glibc-2.34-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1102-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1958-2 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1877-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1958-1 Security update for glibc SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2022-1869 Moderate: glibc security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 8, 2022
References
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793
- https://security.netapp.com/advisory/ntap-20190315-0002/
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806
- https://sourceware.org/bugzilla/show_bug.cgi?id=18986
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=eb04c21373e2a2885f3d52ff192b0499afe3c672
- http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238
- https://sourceware.org/bugzilla/show_bug.cgi?id=11053
- https://support.f5.com/csp/article/K64119434
- https://support.f5.com/csp/article/K64119434?utm_source=f5support&%3Butm_medium=RSS
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list