# CVE-2026-26201

## Summary

- **CVE ID:** CVE-2026-26201
- **Severity:** HIGH
- **CVSS Score:** 7 (CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H)
- **CWE:** CWE-362, CWE-663
- **Published:** Feb 19, 2026
- **Last Modified:** Mar 12, 2026

## Description

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.

## Affected Products

- jm33-m0 — emp3r0r (< 3.21.2)

## References

- [CNA](https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc)
- [CNA](https://github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5)
- [CNA](https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 21.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._