CVE-2026-26068

9.3 criticalEPSS 3.8%

Critical (9.3) in jm33-m0 emp3r0r. EPSS 3.8% chance of exploitation in the next 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.

Severity

CVSS 4.0

9.3 critical

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 3.1

9.9 critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS: 3.8% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-31)
CWEs: CWE-78, CWE-77
Published: 2026-02-12
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

jm33-m0:emp3r0r

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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