{"affected":[{"product":"pam_usb","source":"CNA: GitHub_M","vendor":"mcdope","versions":[{"status":"affected","version":">= 0.8.0, < 0.9.3"}]}],"cveId":"CVE-2026-64669","cwes":["CWE-285","CWE-693"],"description":"pam_usb provides hardware authentication for Linux using removable media. From version 0.8.0 to before version 0.9.3, the deny_remote feature in pam_usb uses /usr/bin/w -i to detect whether the authenticating user has an active remote tmux session. In pusb_tmux_has_remote_clients() (src/tmux.c), the IPv6 detection regex required exactly four explicit colon-separated groups of 1-4 hex digits (e.g. 2001:0db8:85a3:0000). Any IPv6 address in compressed notation — including loopback (::1), link-local (fe80::1), and global unicast addresses (2001:db8::1) — did not match this pattern. As a result the remote-client check silently returned \"no remote clients\" even when a remote tmux client was connected from such an address. This issue has been patched in version 0.9.3.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.4,"severity":"high","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}],"modifiedAt":1794369163930,"publishedAt":1794369163930,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-gc4c-v52c-2v34"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/mcdope/pam_usb/pull/423"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/mcdope/pam_usb/commit/a62513f3da871d6576d751de3482eb80b9ac79f3"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/mcdope/pam_usb/releases/tag/0.9.3"}],"remediation":[],"revision":"cdc73d01b4b8e184e0a0e16bb79aa6c000c53efacb7e0a030ea936c1ee32f305","sources":[{"modifiedAt":1794369163930,"name":"CNA: GitHub_M","retrievedAt":1794370178800,"url":"https://www.cve.org/CVERecord?id=CVE-2026-64669"}],"ssvc":null,"status":"published","title":"pam_usb: deny_remote bypassed by compressed IPv6 addresses in pusb_tmux_has_remote_clients","updatedAt":1794370178800}