{"id":"CVE-2026-41579","aliases":["GHSA-xjvp-4fhw-gc47","GO-2026-5761"],"url":"https://o3.security/vulnerability/CVE-2026-41579","summary":"runc: Malicious image with /dev symlink can trigger limited host filesystem integrity violations","details":"runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.","published":"2026-07-01T00:02:08.639Z","modified":"2026-08-22T18:49:57.660146955Z","cvss":{"score":3.3,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"},"epss":{"score":0.00186,"percentile":0.08293,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/opencontainers/runc","fixedVersion":"1.3.6"},{"ecosystem":"Go","name":"github.com/opencontainers/runc","fixedVersion":"1.4.3"},{"ecosystem":"Go","name":"github.com/opencontainers/runc","fixedVersion":"1.5.0-rc.3"}],"fix":{"url":"https://github.com/opencontainers/runc/commit/864db8042dbb","label":"opencontainers/runc@864db80"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41579.json"},{"type":"ADVISORY","url":"https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41579"},{"type":"FIX","url":"https://github.com/opencontainers/runc/commit/864db8042dbb"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-22T18:49:57.660146955Z"}}