Servers and applications
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 cause a denial of service (assertion failure and application exit) or trigger an incorrect result by attempting a regular-expression match.
- Severity
- High 7.5
- Published
- 26 Feb 2019
- Last changed
- 16 Jun 2026
- Added to UpHeron
- 1 Nov 2026
- Fixed in
- 2.28
- Exploit chance
- 3.9% in the next 30 daysHigher than 90% of CVEs. EPSS by FIRST, 10 Nov 2026
- Weakness
- CWE-19
- Attack
- Over the network · No login needed · No user action needed
- Attacker can
- Take it down
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Sources
- NVD
Affected software
| Software | Affected versions |
|---|---|
GNU C LibraryServers and applications · cpe:a:gnu:glibc |
|