Vulnerability · Published Sep 1, 2026 · Assigned by redhat
CVE-2026-18743Popt-devel: popt-static: short realloc in poptconfigfiletostring
Low 2.5
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 3% of all known vulnerabilities).
Official description
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).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | popt | no fix listed | DEBIAN-CVE-2026-18743 |
| Debian:13 | popt | no fix listed | DEBIAN-CVE-2026-18743 |
| Debian:14 | popt | no fix listed | DEBIAN-CVE-2026-18743 |
| Ubuntu:22.04:LTS | popt | no fix listed | UBUNTU-CVE-2026-18743 |
| Ubuntu:24.04:LTS | popt | no fix listed | UBUNTU-CVE-2026-18743 |
| Ubuntu:26.04:LTS | popt | no fix listed | UBUNTU-CVE-2026-18743 |
| Ubuntu:26.10 | popt | no fix listed | UBUNTU-CVE-2026-18743 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| rpm-software-management | popt | 1.11 – 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-131 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
References
- RHSA-2026:56984 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-18743 vdb-entry, x_refsource_REDHAT
- RHBZ#2510809 issue-tracking, x_refsource_REDHAT