{"id":"CVE-2026-47766","title":"crun is an open source OCI Container Runtime fully written in C","summary":"crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and…","severity":"high","cwe":["CWE-61","CWE-59"],"published":"2026-08-14","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-47766","references":[{"url":"https://github.com/containers/crun/releases/tag/1.28","label":"security-advisories@github.com"},{"url":"https://github.com/containers/crun/security/advisories/GHSA-7vwr-4279-7gq5","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47766.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-47766"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2516081"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-47766"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47766"},{"url":"https://access.redhat.com/errata/RHSA-2026:54855"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00196,"epssPercentile":0.09191,"ingestedAt":"2026-09-18T20:51:25.615Z","vendor":"Red Hat","product":"Red Hat Hardened Images","affected":["hardened_images"],"patched":["hardened_images"],"cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","cvssSource":"vendor","slug":"CVE-2026-47766","body":"## Overview\n\ncrun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and the bundle configuration does not mount `/dev`, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named `ptmx` in the target directory was also replaced by crun's forced `ptmx -> pts/ptmx` symlink. Version 1.28 fixes the issue.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:54855** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:54855)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, 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 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47766.json)","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225763,"id":"CVE-2026-47766","ts":1792498445329,"field":"cvss","old":null,"new":"8.4"},{"seq":225762,"id":"CVE-2026-47766","ts":1792498445329,"field":"severity","old":"none","new":"high"}]}