CVE-2026-26068: emp3r0r is a stealth-focused C2 designed by Linux users for Linux environments

Q: How do I fix CVE-2026-26068?

emp3r0r: upgrade to 3.21.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-26068 being exploited?

CVE-2026-26068 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-26068 affect?

CVE-2026-26068 affects emp3r0r. Severity is critical (CVSS 9.9). 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

Q: How urgent is CVE-2026-26068?

Priority 67/100. Critical severity; Public exploit reference; On your watchlist

This week

CRITICAL 9.9WATCHLISTUPGRADE

CVE-2026-26068 is a critical-severity flaw (CVSS 9.9) affecting emp3r0r. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Critical severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-77, CWE-78
Published	2026-02-12
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: jm33-m0

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-12 22:16 UTCPublished CVE record published
2026-06-17 10:25 UTCUpdated Record last modified

jm33-m0 emp3r0r UPGRADE

Affected: < 3.21.1

Fixed in: 3.21.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy emp3r0r || rpm -q emp3r0r || emp3r0r --version

2. UPGRADE to 3.21.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade emp3r0r

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade emp3r0r

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora ELN · intel-ipsec-mb · FIXED · 3.0.1-1.eln159 · FEDORA-2026-ca01077210 · source

sudo dnf upgrade --advisory=FEDORA-2026-ca01077210

Fedora 46 · complytime-providers · FIXED · 0.3.0-2.fc46 · FEDORA-2026-7c372be466 · source

sudo dnf upgrade --advisory=FEDORA-2026-7c372be466

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjpp

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-26068?

emp3r0r: upgrade to 3.21.1. Exact commands for each OS are on this page.

Is CVE-2026-26068 being exploited?

CVE-2026-26068 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-26068 affect?

CVE-2026-26068 affects emp3r0r. Severity is critical (CVSS 9.9). 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

How urgent is CVE-2026-26068?

Priority 67/100. Critical severity; Public exploit reference; On your watchlist

References

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