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TI-2026-44108 Aliases CVE-2026-61554GHSA-4595-rvpx-4q34

emp3r0r has an unauthenticated HTTP Polling DoS

Priority HIGH 72CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00707 53rd percentileScored 2026-11-07
Fix Fixed emp3r0r (jm33-m0): 4.2.5github.com/jm33-m0/emp3r0r/core (Go): 0.0.0-20260531142011-aed3d81641ab

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
jm33-m0emp3r0rbefore 4.2.54.2.5Patch availableCNA
—github.com/jm33-m0/emp3r0r/core (Go)before 0.0.0-20260531142011-aed3d81641ab0.0.0-20260531142011-aed3d81641abPatch availableGHSA-4595-rvpx-4q34
  • emp3r0r Vendorjm33-m0 Affected before 4.2.5 Fixed in 4.2.5 Patch available CNA
  • github.com/jm33-m0/emp3r0r/core (Go) Vendor— Affected before 0.0.0-20260531142011-aed3d81641ab Fixed in 0.0.0-20260531142011-aed3d81641ab Patch available GHSA-4595-rvpx-4q34

Remediation

  • Fix · CNA emp3r0r (jm33-m0) Fixed in 4.2.5
  • Fix · GHSA-4595-rvpx-4q34 github.com/jm33-m0/emp3r0r/core (Go) Fixed in 0.0.0-20260531142011-aed3d81641ab Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-61554
  2. 2026-10-03 Alias added: GHSA-4595-rvpx-4q34

References

Other 3

  • TI-2026-21072 emp3r0r Agent-Controlled Metadata to Operator RCE (tmux Command Injection) CVSS 4.0CRITICAL 9.3
  • TI-2026-21192 emp3r0r Affected by Concurrent Map Access DoS (panic/crash) CVSS 4.0HIGH 7.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences