EUVD-2026-51652
GHSA-6p72-9j26-4rmx
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network-reachable endpoints (PR:N, AV:N) with a trivially crafted pickle (AC:L) yield full RCE as the process user, giving C:H/I:H/A:H and S:U.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
ComfyUI v0.23.0 contains an unsafe deserialization vulnerability in the LoadTrainingDataset node that allows unauthenticated remote attackers to execute arbitrary Python code by uploading a crafted pickle file and triggering its deserialization. Attackers can upload a malicious shard_*.pkl file via the unauthenticated POST /upload/image endpoint and then queue a workflow graph via POST /prompt referencing the uploaded file, causing torch.load to deserialize the attacker-controlled pickle payload using __reduce__ and execute arbitrary commands as the ComfyUI process user.
Articles & Coverage 2
AnalysisAI
Remote code execution in ComfyUI v0.23.0 (and all prior 0.x releases) lets unauthenticated attackers run arbitrary Python by abandoning the LoadTrainingDataset node to torch.load a malicious pickle. Because the upload and prompt-queue endpoints require no authentication, an attacker who can reach the web interface can upload a crafted shard_*.pkl file and trigger deserialization to execute commands as the ComfyUI process user. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target run ComfyUI 0.23.0 or earlier with its HTTP API network-reachable to the attacker, and that both the unauthenticated POST /upload/image and POST /prompt endpoints be accessible (their default, out-of-the-box state). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, not a high-CVSS-but-low-risk case. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker locates an internet- or LAN-exposed ComfyUI instance and sends an unauthenticated POST /upload/image request carrying a malicious shard_*.pkl whose pickle __reduce__ payload runs os.system with attacker commands. They then POST /prompt with a workflow graph referencing the uploaded file through the LoadTrainingDataset node; when torch.load deserializes it, arbitrary code executes as the ComfyUI process user. … |
| Remediation | Apply the vendor fix from PR #14543 / commit 94ee49b1612824366a8631ea069b2a1fa5c73720 (https://github.com/Comfy-Org/ComfyUI/pull/14543), which changes torch.load to use weights_only=True; upgrade to a build that includes this commit past 0.23.0 - an exact tagged patched release version is not independently confirmed from the provided data, so verify the running build contains the commit. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all ComfyUI deployments running v0.23.0 or earlier and restrict network access to the web interface if immediate patching is not feasible; prioritize isolating internet-facing instances. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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