What is CVE-2026-18743?

CVE-2026-18743 is a low-severity vulnerability in Rpm-Software-Management Popt, classified under Incorrect Calculation of Buffer Size. CVSS score: 2.5/10. Published 2026-09-01.

How severe is CVE-2026-18743?

Low severity. CVSS v3 base score is 2.5 out of 10.

Vulnerability in Rpm-Software-Management Popt

CVE-2026-18743

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 v3 metric

CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size

References

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

Frequently asked questions

What is CVE-2026-18743?: CVE-2026-18743 is a low-severity vulnerability in Rpm-Software-Management Popt, classified under Incorrect Calculation of Buffer Size. CVSS score: 2.5/10. Published 2026-09-01.
How severe is CVE-2026-18743?: Low severity. CVSS v3 base score is 2.5 out of 10.