Critical 9.3Published Feb 12, 2026

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

Updated under an hour ago (Oct 27, 2026, 12:20 PM ET)

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It affects jm33-m0 emp3r0r and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for jm33-m0 emp3r0r

Exploited in the last 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.

CVSS: 9.3 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-77, CWE-78
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Feb 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

jm33-m0 emp3r0r jm33_m0:emp3r0r (from the name)	before 3.21.1	CNA record
jm33-m0 emp3r0r jm33-m0:emp3r0r	before 3.21.1	NVD

References

References

https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjpp	x-refsource-confirm, exploit, vendor-advisory
https://github.com/jm33-m0/emp3r0r/commit/0cd64e4a26e7839a9a54bca3d756a665fcb7fda0	x-refsource-misc, patch
https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.1	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.