{"id":"CVE-2026-90954","revision":"e4df8c17f12640eb841819b78d0e465b","records":[{"revision":"e4df8c17f12640eb841819b78d0e465b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90954","aliases":[],"title":"Busybox: busybox: dpkg-deb extraction-root escape via per-ar-member deferred symlink flush","description":"A flaw was found in BusyBox's dpkg-deb archive extraction. The ar archive handler flushes deferred symlinks after each archive member, unlike the tar, cpio, and unzip handlers which flush once after the last member. A specially crafted .deb archive with two data.tar members can exploit this ordering: the first member declares a symlink pointing to an absolute path (e.g., '/'), which is deferred as unsafe but flushed after the first member. The second member declares a regular file whose path traverses the now-live symlink, resulting in a file being written outside the intended extraction directory. This could allow an attacker to write arbitrary files to arbitrary locations when a user extracts a crafted .deb package.","state":0,"publishedAt":"2026-10-14T10:00:08.215+00:00","modifiedAt":"2026-10-19T19:04:36.467+00:00","affected":[{"ecosystem":"https://access.redhat.com/downloads/content/package-browser/","name":"busybox","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat Hardened Images\",\n                    \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\",\n                    \"packageName\": \"busybox\",\n                    \"defaultStatus\": \"affected\",\n                    \"cpes\": [\n                        \"cpe:/a:redhat:hummingbird:1\"\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://access.redhat.com/security/cve/CVE-2026-90954","https://bugzilla.redhat.com/show_bug.cgi?id=2533007"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90954","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90954","identifiers":["CVE-2026-90954"]},"retained":false,"historicalAffected":[]}],"coverage":[]}