Low severity · published Aug 5, 2026
CVE-2026-18839
Popt-devel: popt-static: size_t underflow in singleoptionhelp
2.2
CVSS
0.1%
EPSS
No
On KEV
Description
An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% 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
1.13 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18839
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18839
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:77932
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-18839
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2511010
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