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CVE-2009-5155
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…
- 7.5HighCVSS base score
- 3.9%Exploitation in 30 daysEPSS · top 9.6% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
- 1 day later
· 1 day later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 3.9% · top 9.6% of all CVEs (10 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
n/a
- affected n/a
References
12
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793 (opens in a new tab)x_refsource_MISCx_transferred
- https://security.netapp.com/advisory/ntap-20190315-0002/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806 (opens in a new tab)x_refsource_MISCx_transferred
- https://sourceware.org/bugzilla/show_bug.cgi?id=18986 (opens in a new tab)x_refsource_MISCx_transferred
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=eb04c21373e2a2885f3d52ff192b0499afe3c672 (opens in a new tab)x_refsource_MISCx_transferred
- http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272 (opens in a new tab)x_refsource_MISCx_transferred
- https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238 (opens in a new tab)x_refsource_MISCx_transferred
- https://sourceware.org/bugzilla/show_bug.cgi?id=11053 (opens in a new tab)x_refsource_MISCx_transferred
- https://support.f5.com/csp/article/K64119434 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://support.f5.com/csp/article/K64119434?utm_source=f5support&%3Butm_medium=RSS (opens in a new tab)x_refsource_CONFIRMx_transferred
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2009-5109 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2009-5155)Record last updated .