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CVE-2026-26201

Jm33-m0 Emp3r0r race condition

7.5 HIGHPublic exploitEPSS 0.45%
  1. Published19 Feb 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Jm33-m0 Emp3r0r< 3.21.2

Remediation

Fixed in
Jm33-m0 Emp3r0r≥ 3.21.2

References

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Frequently asked

Is CVE-2026-26201 being actively exploited?

CVE-2026-26201 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.45%.

How severe is CVE-2026-26201?

CVE-2026-26201 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.45% probability of exploitation.

Which products are affected by CVE-2026-26201?

Affected products include Jm33-m0 Emp3r0r.

How do I fix CVE-2026-26201?

Upgrade affected software to a fixed version, for example Jm33-m0 Emp3r0r 3.21.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26201 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.