{"id":"UBUNTU-CVE-2026-61725","details":"sevenz-rust2 is a Rust-native 7z compressor and `decompress`or. Prior to 0.21.1, extracting an attacker-supplied 7z archive can write or overwrite files outside the destination directory. In `src/util/decompress.rs`, `decompress_impl` computes each destination with `dest.join(entry.name())` without normalizing the archive's UTF-16 entry name or verifying containment, and `default_entry_extract_fn` writes to it with `File::create`. Parent-directory components escape the extraction root, and an absolute entry path makes the join discard the destination entirely. The convenience entry points `decompress`, `decompress_file`, `decompress_with_password`, and `decompress_file_with_password` all use this default path. Overwriting writable configuration, startup, cron, or build files can lead to code execution or persistence. The archive bytes are the attacker-controlled trust boundary, including for applications that automatically unpack uploaded or otherwise untrusted archives. This issue is fixed in version 0.21.1.","modified":"2026-11-04T03:30:21.044563820Z","published":"2026-11-03T00:00:00Z","upstream":["CVE-2026-61725"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-61725"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-61725"},{"type":"REPORT","url":"https://github.com/hasenbanck/sevenz-rust2/security/advisories/GHSA-qh76-45cr-8xrc"},{"type":"REPORT","url":"https://github.com/hasenbanck/sevenz-rust2/commit/ef760b61f3535ac8b93006212aef41bfebc237eb"}],"affected":[{"package":{"name":"rust-sevenz-rust2","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/rust-sevenz-rust2?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.21.6+ds-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-sevenz-rust2-dev","binary_version":"0.21.6+ds-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61725.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L"},{"type":"Ubuntu","score":"medium"}]}