CVE-2024-21577
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedComfyUI-Ace-Nodes is vulnerable to Code Injection. The ACE_ExpressionEval node contains an eval() in its entrypoint function that accepts arbitrary user-controlled data. A user can create a workflow that results in executing arbitrary code on the server.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe ACE_ExpressionEval node in ComfyUI-Ace-Nodes uses eval() on user-controlled input without sanitization, allowing arbitrary code execution on the server. An attacker can craft a malicious workflow to execute OS-level commands.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm ComfyUI-Ace-Nodes installationRun pip list or check your ComfyUI custom_nodes directory for the ace-nodes package and note the installed versionAffected if The package version falls within any affected range or cannot be determined from a trusted source
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Locate the ACE_ExpressionEval node filesSearch the ComfyUI-Ace-Nodes installation directory for files containing 'ACE_ExpressionEval' or 'ExpressionEval' in the filename or node registration codeAffected if The ACE_ExpressionEval node exists in the installation
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Inspect the node implementation for eval() usageOpen the Python source file defining the ACE_ExpressionEval node and search for calls to Python's eval() or exec() functions operating on user inputAffected if The code uses eval() or exec() on user-supplied input without visible sanitization or sandboxing
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Review active workflows for node usageExamine any saved workflow JSON files in your ComfyUI user directory or workflow storage for references to the ACE_ExpressionEval node typeAffected if Workflows contain active instances of the ACE_ExpressionEval node
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Verify authentication requirementsCheck whether the ComfyUI server is exposed to untrusted users or if ACE_ExpressionEval nodes are accessible without authenticationAffected if The node is accessible to authenticated but untrusted users
You are affected if ComfyUI-Ace-Nodes is installed, the ACE_ExpressionEval node exists, and the node's implementation uses eval() on user input that could be supplied by authenticated users.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataReplace the unsafe eval() with a secure expression parser (e.g., ast.literal_eval, restricted mathematical expression evaluator) or remove the eval() entirely and implement safe expression parsing.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-21577 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-21577 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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