by Kastro
Paper/Archive/CVE-2026-26068

CVE-2026-26068

jm33-m0 emp3r0r — emp3r0r Agent-Controlled Metadata to Operator RCE (tmux Command Injection)

EPSS 4%public exploitCVSS 9.9
critical.is priorityof 100
58
CVSS 9.9 (NVD)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 90.0.900 × 2018.0Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
emp3r0r< 3.21.1–CNA

Scores by source

NVD9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
GitHub_M (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

refgithub.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjpprefgithub.com/jm33-m0/emp3r0r/commit/0cd64e4a26e7839a9a54bca3d756a665fcb7fda0refgithub.com/jm33-m0/emp3r0r/releases/tag/v3.21.1