CVE-2009-5155
CVSS v3
7.5
HIGH
EPSS Score
3.9 %
exploit probability, as of 2026-10-19
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
glibc: parse_reg_exp in posix/regcomp.c misparses alternatives leading to denial of service or trigger incorrect result
glibc.src as a component of Red Hat Enterprise Linux 5 · glibc as a component of Red Hat Enterprise Linux 6 · glibc-common as a component of Red Hat Enterprise Linux 6
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.
Technical details
- Published
- 2019-02-26
Frequently asked questions
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