CVE-2026-26068 PUBLISHED

emp3r0r Agent-Controlled Metadata to Operator RCE (tmux Command Injection)

Assigner: GitHub_M
Reserved: 10.02.2026 Published: 12.02.2026 Updated: 12.02.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	Low
User Interaction	Active

CVSS 4.0

Product Status

Vendor	jm33-m0
Product	emp3r0r
Versions	Version < 3.21.1 is affected

References

Problem Types

CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') CWE
CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE