Is CVE-2026-18839 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18839?

CVE-2026-18839 has a CVSS v3 severity of LOW (2.2).

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CVE-2026-18839

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.