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NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
A model's config.json can run Python in Unsloth — no pickle, no trust_remote_code, VulnCheck (@VulnCheckAI) says. The patched version belongs to unsloth-zoo, not unsloth. No exploitation reported. https://severitydaily.com/unsloth-cve-2026-93348-config-json-model-type-exec-zoo-2026-8-14/