CVE-2026-61554High· 7.5▾ MidnightPoC availableemp3r0r 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 unauthenti…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 41.3 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Exploit / PoC code exists
0.5%
0.5% → 0.7%
Last analysed / modified upstream
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
github.com/jm33-m0/emp3r0r/core < 0.0.0-20260531142011-aed3d81641abPatched in:
github.com/jm33-m0/emp3r0r/core 0.0.0-20260531142011-aed3d81641abField changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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