CVE-2026-26201

emp3r0r is a C2 designed by Linux users for Linux environments. Prior to version 3.21.2, multiple shared maps are accessed without consistent synchronization across goroutines. Under concurrent activity, Go runtime can trigger `fatal error: concurrent map read and map write`, causing C2 process crash (availability loss). Version 3.21.2 fixes this issue.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5	Patch
https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2	Product Release Notes
https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:jm33-m0:emp3r0r:*:*:*:*:*:*:*:*

History

26 Feb 2026, 02:51

Type	Values Removed	Values Added
First Time		Jm33-m0 emp3r0r Jm33-m0
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
CPE		cpe:2.3:a:jm33-m0:emp3r0r::::::::
References	~~() https://github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5 -~~	() https://github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5 - Patch
References	~~() https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2 -~~	() https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2 - Product, Release Notes
References	~~() https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc -~~	() https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc - Exploit, Vendor Advisory

19 Feb 2026, 20:25

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-02-19 20:25

Updated : 2026-02-26 02:51

NVD link : CVE-2026-26201

Mitre link : CVE-2026-26201

CVE.ORG link : CVE-2026-26201

JSON object : View

Products Affected

jm33-m0

emp3r0r

CWE

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-663

Use of a Non-reentrant Function in a Concurrent Context

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