Vulnerability record · CVE-2026-26201 · published 19 February 2026

CVE-2026-26201: Jm33-m0 emp3r0r race condition vulnerability

JJm33 M0 · Emp3r0r

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.

7.0 CVSS 4.0 High EPSS 0.45% · top 63.1% CWE-362 · Race conditionCWE-663 · CWE-663

7.0CVSS 4.0 base score

0.45%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References, 1 tagged exploit

17 Jun 2026Last modified by NVD

Description

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/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

JEmp3r0r Jm33 M0

References

Link	Tags
https://github.com/jm33-m0/emp3r0r/commit/ea4d074f081dac6293f3aec38f01def5f08d5af5	Patch
https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.2	ProductRelease Notes
https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-f5p9-j34q-pwcc	ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-26201), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.