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Vulnerability Details :

CVE-2026-26068

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-12 Feb, 2026 | 22:01
Updated At-12 Feb, 2026 | 22:01
Rejected At-
Credits

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

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.

Vendors
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Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:12 Feb, 2026 | 22:01
Updated At:12 Feb, 2026 | 22:01
Rejected At:
▼CVE Numbering Authority (CNA)
emp3r0r Agent-Controlled Metadata to Operator RCE (tmux Command Injection)

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
Vendor
jm33-m0
Product
emp3r0r
Versions
Affected
  • < 3.21.1
Problem Types
TypeCWE IDDescription
CWECWE-77CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWECWE-78CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Type: CWE
CWE ID: CWE-77
Description: CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Type: CWE
CWE ID: CWE-78
Description: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Metrics
VersionBase scoreBase severityVector
4.09.3CRITICAL
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
Version: 4.0
Base score: 9.3
Base severity: CRITICAL
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjpp
x_refsource_CONFIRM
https://github.com/jm33-m0/emp3r0r/commit/0cd64e4a26e7839a9a54bca3d756a665fcb7fda0
x_refsource_MISC
https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.1
x_refsource_MISC
Hyperlink: https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjpp
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/jm33-m0/emp3r0r/commit/0cd64e4a26e7839a9a54bca3d756a665fcb7fda0
Resource:
x_refsource_MISC
Hyperlink: https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.1
Resource:
x_refsource_MISC
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:12 Feb, 2026 | 22:16
Updated At:12 Feb, 2026 | 22:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.09.3CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 9.3
Base severity: CRITICAL
Vector:
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-77Primarysecurity-advisories@github.com
CWE-78Primarysecurity-advisories@github.com
CWE ID: CWE-77
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-78
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/jm33-m0/emp3r0r/commit/0cd64e4a26e7839a9a54bca3d756a665fcb7fda0security-advisories@github.com
N/A
https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.1security-advisories@github.com
N/A
https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjppsecurity-advisories@github.com
N/A
Hyperlink: https://github.com/jm33-m0/emp3r0r/commit/0cd64e4a26e7839a9a54bca3d756a665fcb7fda0
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.1
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjpp
Source: security-advisories@github.com
Resource: N/A

Change History

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