{"id":"DEBIAN-CVE-2026-41991","details":"GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks. A local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite.  This issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269","modified":"2026-10-01T03:02:45.380818883Z","published":"2026-06-29T12:16:29.770Z","upstream":["CVE-2026-41991"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-41991"}],"affected":[{"package":{"name":"gzip","ecosystem":"Debian:12","purl":"pkg:deb/debian/gzip?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.12-1","1.12-1.1","1.12-1.2","1.13-1","1.13.56~e549-1~exp1","1.14-1","1.14-1~exp1","1.14-1~exp2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41991.json"}},{"package":{"name":"gzip","ecosystem":"Debian:13","purl":"pkg:deb/debian/gzip?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13-1+deb13u1"}]}],"versions":["1.13-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41991.json"}},{"package":{"name":"gzip","ecosystem":"Debian:14","purl":"pkg:deb/debian/gzip?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14-1"}]}],"versions":["1.13-1","1.13.56~e549-1~exp1","1.14-1~exp1","1.14-1~exp2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41991.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N"}]}