AI agents use imhex_write_hex to create or update resources in ImHex MCP Integration — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ImHex MCP Integration environment.
This tool modifies binary file data through hex writes. While reversible (data can be overwritten again), it has high severity in the context of a reverse engineering tool because: (1) malicious hex writes could corrupt binaries, inject shellcode, or modify firmware in a live analysis session; (2) the tool operates on files that may be system-critical or security-sensitive during malware/firmware analysis workflows;…
From the tool's definition Tool name 'imhex_write_hex' and description 'Write hex data to the currently open file' explicitly indicate modification of file contents. The verb 'write' combined with 'to the currently open file' confirms data is being created or modified reversibly.
Documented attack patterns abuse exactly the kind of access imhex_write_hex gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ImHex MCP Integration, and nothing reaches the server without passing your rules. This is the rule we recommend for imhex_write_hex:
{
"version": "1",
"default": "deny",
"tools": {
"imhex_write_hex": {
"limits": [
{
"counter": "imhex_write_hex_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}imhex_write_hex stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Write hex data to the currently open file. It is categorised as a Write tool in the ImHex MCP Integration MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the ImHex MCP Integration MCP server in PolicyLayer and add a rule for imhex_write_hex: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches ImHex MCP Integration. Nothing to install.
imhex_write_hex is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the imhex_write_hex rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for imhex_write_hex. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
imhex_write_hex is provided by the ImHex MCP Integration MCP server (jmpnop/imhexmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ImHex MCP Integration, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
27 ImHex MCP Integration tools catalogued and risk-classified — across an index of 43,000+ MCP servers.