CVE-2026-26201
Concurrent Map Access Crash in emp3r0r C2 Causes Availability Loss
Publication date: 2026-02-19
Last updated on: 2026-02-26
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| jm33-m0 | emp3r0r | to 3.21.2 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-362 | The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. |
| CWE-663 | The product calls a non-reentrant function in a concurrent context in which a competing code sequence (e.g. thread or signal handler) may have an opportunity to call the same function or otherwise influence its state. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
The vulnerability exists in emp3r0r, a command and control (C2) software designed for Linux environments. Prior to version 3.21.2, the software accesses multiple shared maps without proper synchronization across goroutines. This lack of synchronization can cause the Go runtime to trigger a fatal error due to concurrent map read and write operations, which leads to the crash of the C2 process.
How can this vulnerability impact me? :
This vulnerability can cause the emp3r0r C2 process to crash unexpectedly under concurrent activity. The crash results in a loss of availability of the C2 service, potentially disrupting operations that rely on this software.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, upgrade emp3r0r to version 3.21.2 or later, where the issue with concurrent map access causing process crashes has been fixed.