What is CVE-2026-18839?

CVE-2026-18839 is a low-severity vulnerability in Rpm-Software-Management Popt, classified under Integer Underflow. CVSS score: 2.2/10. Published 2026-08-05.

How severe is CVE-2026-18839?

Low severity. CVSS v3 base score is 2.2 out of 10.

Integer overflow in Rpm-Software-Management Popt

CVE-2026-18839

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.

EPSS: 0.001 (0.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.2 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-18839?: CVE-2026-18839 is a low-severity vulnerability in Rpm-Software-Management Popt, classified under Integer Underflow. CVSS score: 2.2/10. Published 2026-08-05.
How severe is CVE-2026-18839?: Low severity. CVSS v3 base score is 2.2 out of 10.