emp3r0r Agent-Controlled Metadata to Operator RCE (tmux Command Injection)
Priority HIGH 75CWE-77Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-77.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.03792 90th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed emp3r0r (jm33-m0): 3.21.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA emp3r0r (jm33-m0) Fixed in 3.21.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-26068
- 2026-10-11 EPSS moved to the 90th–95th percentile
- 2026-10-25 EPSS moved to the 50th–90th percentile
- 2026-11-04 EPSS moved to the 90th–95th percentile
References
More jm33-m0 Emp3r0r vulnerabilities
- TI-2026-21192 emp3r0r Affected by Concurrent Map Access DoS (panic/crash) CVSS 4.0HIGH 7.0
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences