{"id":"CVE-2026-84042","title":"A flaw was found in crun","summary":"A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The iss…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-269"],"vendor":"Red Hat","product":"crun","affected":["crun (all versions)","container-tools:rhel8/crun","crun (all versions)","crun","crun","openshift/ose-rhel-coreos-8","openshift/ose-rhel-coreos-9"],"published":"2026-09-10","updated":"2026-09-15","sourceUpdated":"2026-09-15T17:17:28.130","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84042","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-84042","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2531222","label":"secalert@redhat.com"},{"url":"https://github.com/containers/crun/","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84042.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84042"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84042"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-10T17:34:01.587198Z"},"epss":0.00137,"epssPercentile":0.02505,"ingestedAt":"2026-09-11T14:42:19.866Z","slug":"CVE-2026-84042","body":"## Overview\n\nA flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84042.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}