Low severity · published Sep 1, 2026
CVE-2026-18743
Popt-devel: popt-static: short realloc in poptconfigfiletostring
2.5
CVSS
0.1%
EPSS
No
On KEV
Description
A flaw was found in popt. This vulnerability allows an attacker to provide specially crafted configuration content to a host, which, when loaded, can lead to a small memory corruption issue. This occurs because of an error in how the `poptConfigFileToString` function reallocates memory for buffers. Successful exploitation could result in heap metadata corruption, potentially causing the affected process to become unavailable (denial of service).
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: vendor
PO
popt · rpm-software-management
1.11 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18743
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18743
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:56984
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-18743
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2510809
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