{"id":"CVE-2026-90954","title":"A flaw was found in BusyBox's dpkg-deb archive extraction","summary":"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 .…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-59"],"published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T10:17:57.297","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90954","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-90954","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533007","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90954.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90954"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90954"}],"tags":["nvd","csaf","vex","red-hat"],"ingestedAt":"2026-10-14T10:25:41.203Z","vendor":"Red Hat","product":"Red Hat Hardened Images","affected":["hardened_images"],"slug":"CVE-2026-90954","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90954.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}