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CVE-2026-61554

emp3r0r has an unauthenticated HTTP Polling DoS

emp3r0r is a C2 designed by Linux users for Linux environments. Prior to version 4.2.5, the `http_poll` C2 transport accepts attacker-controlled HTTP polling sessions before CBOR `MsgAuth` authentication is completed. A remote unauthenticated attacker can create arbitrary polling sessions and send request bodies that are forwarded into the C2 dispatch path. This can consume server resources and trigger pre-auth C2 processing. Version 4.2.5 patches the issue.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Jm33-m0
Products
Emp3r0r
CVE-2026-26068

emp3r0r Agent-Controlled Metadata to Operator RCE (tmux Command Injection)

emp3r0r is a stealth-focused C2 designed by Linux users for Linux environments. Prior to 3.21.1, untrusted agent metadata (Transport, Hostname) is accepted during check-in and later interpolated into tmux shell command strings executed via /bin/sh -c. This enables command injection and remote code execution on the operator host. This vulnerability is fixed in 3.21.1.

CVSS 4.0 · 9.3 Critical EPSS 3.7% KEV · Not listed
Vendors
Jm33-m0
Products
Emp3r0r
CVE-2026-26201

emp3r0r Affected by Concurrent Map Access DoS (panic/crash)

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 4.0 · 7 High EPSS < 1% KEV · Not listed
Vendors
Jm33-m0
Products
Emp3r0r