{"id":"CVE-2026-87766","summary":"Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup","details":"A flaw was found in bubblewrap. During sandbox setup, creating files or directories under the new root can follow a parent symlink onto the host via /oldroot, writing attacker-chosen paths outside the sandbox as the launching user. This happens before the sandboxed process starts. This issue is GHSA-pxhw-h44j-8pfx. It is fixed in bubblewrap 0.12.0.","aliases":["GHSA-pxhw-h44j-8pfx"],"modified":"2026-09-11T03:48:22.646751526Z","published":"2026-09-09T08:34:35.359Z","database_specific":{"cna_assigner":"redhat","cwe_ids":["CWE-59"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87766.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/09/09/3"},{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"WEB","url":"https://bugs.debian.org/1145655"},{"type":"WEB","url":"https://github.com/containers/bubblewrap/releases/tag/v0.12.0"},{"type":"WEB","url":"https://www.openwall.com/lists/oss-security/2026/08/27/7"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-87766"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87766.json"},{"type":"ADVISORY","url":"https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87766"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2530542"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/containers/bubblewrap","events":[{"introduced":"0"},{"fixed":"2a76602a8c71f36c1527cf9fc3417d9149822e0c"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v0.11.2","v0.11.1","v0.11.0","v0.10.0","v0.6.2","v0.9.0","v0.8.0","v0.7.0","v0.6.1","v0.6.0","v0.5.0","v0.4.1","v0.4.0","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.1","v0.2.0","v0.1.8","v0.1.7","v0.1.5","v0.1.4","v0.1.3","0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87766.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}