glibc: parse_reg_exp in posix/regcomp.c misparses alternatives leading to denial of service or trigger incorrect result
Published Feb 26, 2019
7.5
HIGHCVSS 3.0
EPSS 3.91%
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.
Affected products
No data.
Configuration 2
- n/a
- n/a
- n/a
No data.
Red Hat Enterprise Linux 5
glibc
Will not fix
Red Hat Enterprise Linux 6
glibc
Will not fix
Red Hat Enterprise Linux 7
glibc
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | glibc | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | glibc | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | glibc | Affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 3.91% (0.03906) | 89.96th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.91% (0.03906) | 88.89th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.10% (0.01102) | 76.08th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.38% (0.03378) | 78.77th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.13% (0.01133) | 76.86th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.47% (0.00469) | 76.37th | v3 (v2023.03.01) |
| Jul 19, 2024 | 0.47% (0.00469) | 75.82th | v3 (v2023.03.01) |
| Feb 20, 2024 | 0.51% (0.00513) | 76.00th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.44% (0.00441) | 74.09th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.44% (0.00441) | 71.91th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.48% (0.00478) | 72.02th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
References (16)
- http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272 x_refsource_MISCMailing ListPatchVendor Advisory
- https://access.redhat.com/security/cve/CVE-2009-5155 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1683683 Issue Tracking
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793 x_refsource_MISCMailing ListVendor Advisory
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806 x_refsource_MISCExploitMailing ListVendor Advisory
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238 x_refsource_MISCExploitMailing ListVendor Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2009-5155
- https://security.netapp.com/advisory/ntap-20190315-0002/ x_refsource_CONFIRMPatchThird Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=11053 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=18986 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=eb04c21373e2a2885f3d52ff192b0499afe3c672 x_refsource_MISC
- https://support.f5.com/csp/article/K64119434 x_refsource_CONFIRM
- https://support.f5.com/csp/article/K64119434?utm_source=f5support&%3Butm_medium=RSS x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2009-5155
Change history (0)
No recorded changes yet.