{"id":"CVE-2026-18743","title":"A flaw was found in popt","summary":"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 `po…","severity":"low","cvss":2.5,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-131"],"vendor":"rpm-software-management","product":"popt","affected":["popt >= 1.11 < *","popt-main (all versions)","popt (all versions)","popt (all versions)","popt (all versions)","popt (all versions)","popt (all versions)","openshift/ose-rhel-coreos-8 (all versions)","openshift/ose-rhel-coreos-9 (all versions)"],"published":"2026-09-01","updated":"2026-09-08","sourceUpdated":"2026-09-08T23:17:23.813","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18743","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:56984","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-18743","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2510809","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18743.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18743"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18743"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-01T13:18:26.638625Z"},"epss":0.00141,"epssPercentile":0.0381,"ingestedAt":"2026-09-08T23:13:54.646Z","patched":["hardened_images"],"slug":"CVE-2026-18743","body":"## Overview\n\nA 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).\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:56984** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56984)\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18743.json)","depth":"sunlit","depthScore":14,"depthScoreParts":{"impact":13.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}