Bug 2542526 (CVE-2026-93348)

Summary: CVE-2026-93348 unsloth-zoo: unsloth: Unsloth Zoo: Arbitrary code execution via crafted model configuration
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Unsloth Zoo, which can lead to arbitrary code execution when loading a machine learning model. The vulnerability exists due to improper input sanitization of the model type parameter within configuration files during compilation. An attacker can exploit this issue by supplying a specially crafted model configuration containing embedded commands, resulting in the execution of arbitrary code with the privileges of the user running model training or inference.
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Description OSIDB Bzimport 2026-09-28 15:32:29 UTC 
Unsloth Zoo versions 2025.9.9 before 2026.8.14, as implemented in Unsloth 2025.9.9 through 2026.8.19, contains a code injection vulnerability in the model-loading compile path where the get_transformers_model_type() function in hf_utils.py collects model_type values from nested model configurations without enforcing a character allowlist, allowing newlines and arbitrary Python source to survive normalization. Attackers can embed a newline in a nested model_type value within a malicious model's config.json to terminate the generated import statement and execute arbitrary Python code via exec() in unsloth_compile_transformers(), achieving remote code execution as the loading user when the model is loaded for training or inference.