CVE-2026-26068: JM33-m0 EMP3R0R

Critical severity, CVSS 9.9. EPSS: 4.1% chance of exploitation in the next 30 days.

emp3r0r is a stealth-focused C2 designed by Linux users for Linux environments. Prior to 3.21.1, untrusted agent metadata (Transport, Hostname) is accepted during check-in and later interpolated into tmux shell command strings executed via /bin/sh -c. This enables command injection and remote code execution on the operator host. This vulnerability is fixed in 3.21.1.

Affected products

• JM33-m0 EMP3R0R: before 3.21.1 (fixed in 3.21.1)

Published 2026-02-12. Last modified 2026-06-17.