CVE-2026-61554

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

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.7% chance of exploitation in the next 30 days; higher than 53% of CVEs (scores of 2026-10-25)

CWE

CWE-400

Published

2026-09-15

Modified

2026-09-30

Record from

the NVD, synced 2026-10-19

Packages (OSV)

References

• https://github.com/jm33-m0/emp3r0r/releases/tag/v4.2.5
• https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-4595-rvpx-4q34
• https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-4595-rvpx-4q34

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