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Vulnerability · Published Aug 5, 2026 · Assigned by redhat

CVE-2026-18839Popt-devel: popt-static: size_t underflow in singleoptionhelp

Low 2.2

In plain English

A low-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)2.2Low
Exploit odds (30 days)0.1%top 97.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12poptno fix listedDEBIAN-CVE-2026-18839
Debian:13poptno fix listedDEBIAN-CVE-2026-18839
Debian:14poptno fix listedDEBIAN-CVE-2026-18839
Ubuntu:22.04:LTSpoptno fix listedUBUNTU-CVE-2026-18839
Ubuntu:24.04:LTSpoptno fix listedUBUNTU-CVE-2026-18839
Ubuntu:26.04:LTSpoptno fix listedUBUNTU-CVE-2026-18839
Ubuntu:26.10poptno fix listedUBUNTU-CVE-2026-18839

Affected products (as reported)

VendorProductVersions
rpm-software-management popt 1.13 – before *
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-191 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L

References