GNU Emacs before 31.2 (and TRAMP through 2.8.2) allows OS command injection via a filename because tramp-user-regexp has an incomplete list of disallowed inputs. NOTE: this issue exists because of an incomplete fix for CVE-2026-79992.Referenceshttps://ftp.gnu.org/gnu/tramp/tramp-2.8.2.tar.gzhttps://www.openwall.com/lists/oss-security/2026/10/11/1https://www.openwall.com/lists/oss-security/2026/08/21/1
