What’s Vulnerable › Vulnerabilities

CVE-2026-26068: emp3r0r Agent-Controlled Metadata to Operator RCE (tmux Command Injection)

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-12 · updated 2026-06-17
• Weakness: CWE-77

Description

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

How to fix

Upgrade to a fixed version: jm33-m0 emp3r0r 3.21.1. Check the vendor advisory for mitigations.

References

• https://github.com/jm33-m0/emp3r0r/commit/0cd64e4a26e7839a9a54bca3d756a665fcb7fda0
• https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.1
• https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjpp

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