{"cve":"CVE-2025-31133","nvd":{"published":"2025-11-06T19:15:41.343","modified":"2026-10-07T21:10:00.200","status":"Analyzed","description":"runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7 and below, 1.3.0-rc.1 through 1.3.1, 1.4.0-rc.1 and 1.4.0-rc.2 files, runc would not perform sufficient verification that the source of the bind-mount (i.e., the container's /dev/null) was actually a real /dev/null inode when using the container's /dev/null to mask. This exposes two methods of attack:  an arbitrary mount gadget, leading to host information disclosure, host denial of service, container escape, or a bypassing of maskedPaths. This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","score":7.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","score":7.8},"cwes":["CWE-61","CWE-363"],"references":["https://github.com/opencontainers/runc/commit/1a30a8f3d921acbbb6a4bb7e99da2c05f8d48522","https://github.com/opencontainers/runc/commit/5d7b2424072449872d1cd0c937f2ca25f418eb66","https://github.com/opencontainers/runc/commit/8476df83b534a2522b878c0507b3491def48db9f","https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64","https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2"],"products":["linuxfoundation:runc"],"source":"nvd","synced_at":"2026-10-19T22:14:53.307938015+00:00"},"epss":{"cve":"CVE-2025-31133","score":0.01245,"percentile":0.69096,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-9493-h29p-rfm2","url":"https://osv.dev/vulnerability/GHSA-9493-h29p-rfm2","summary":"runc container escape via \"masked path\" abuse due to mount race conditions","modified":"2026-09-10T03:50:30.785749905Z","packages":[{"ecosystem":"Go","name":"github.com/opencontainers/runc","purl":"pkg:golang/github.com/opencontainers/runc","ranges":["<1.2.8"],"fixed":["1.2.8"]},{"ecosystem":"Go","name":"github.com/opencontainers/runc","purl":"pkg:golang/github.com/opencontainers/runc","ranges":[">=1.3.0-rc.1 <1.3.3"],"fixed":["1.3.3"]},{"ecosystem":"Go","name":"github.com/opencontainers/runc","purl":"pkg:golang/github.com/opencontainers/runc","ranges":[">=1.4.0-rc.1 <1.4.0-rc.3"],"fixed":["1.4.0-rc.3"]}]},{"id":"GO-2025-4096","url":"https://osv.dev/vulnerability/GO-2025-4096","summary":"Container escape via \"masked path\" abuse due to mount race conditions in github.com/opencontainers/runc","modified":"2026-02-04T03:11:33.546218Z","packages":[{"ecosystem":"Go","name":"github.com/opencontainers/runc","purl":"pkg:golang/github.com/opencontainers/runc","ranges":["<1.2.8",">=1.3.0-rc.1 <1.3.3",">=1.4.0-rc.1 <1.4.0-rc.3"],"fixed":["1.2.8","1.3.3","1.4.0-rc.3"]}]}],"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."]}