{"cve":"CVE-2021-30465","nvd":{"published":"2021-05-27T13:15:08.077","modified":"2026-06-17T03:50:17.630","status":"Modified","description":"runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.5},"cwes":["CWE-362"],"references":["http://www.openwall.com/lists/oss-security/2021/05/19/2","http://www.openwall.com/lists/oss-security/2021/05/19/2","http://www.openwall.com/lists/oss-security/2021/05/19/2","http://www.openwall.com/lists/oss-security/2021/05/19/2","https://bugzilla.opensuse.org/show_bug.cgi?id=1185405"],"products":["fedoraproject:fedora","linuxfoundation:runc"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-30465","score":0.10245,"percentile":0.95684,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c3xm-pvg7-gh7r","url":"https://osv.dev/vulnerability/GHSA-c3xm-pvg7-gh7r","summary":"mount destinations can be swapped via symlink-exchange to cause mounts outside the rootfs","modified":"2026-09-10T03:49:14.427758087Z","packages":[{"ecosystem":"Go","name":"github.com/opencontainers/runc","purl":"pkg:golang/github.com/opencontainers/runc","ranges":["<1.0.0-rc95"],"fixed":["1.0.0-rc95"]}]},{"id":"GO-2022-0914","url":"https://osv.dev/vulnerability/GO-2022-0914","summary":"Mount destinations can be swapped via symlink-exchange to cause mounts outside the rootfs in github.com/opencontainers/runc","modified":"2026-02-04T02:21:49.205668Z","packages":[{"ecosystem":"Go","name":"github.com/opencontainers/runc","purl":"pkg:golang/github.com/opencontainers/runc","ranges":["<1.0.0-rc95"],"fixed":["1.0.0-rc95"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}