Vulnerability · Published Sep 28, 2026 · Assigned by VulnCheck

CVE-2026-93348Unsloth Zoo Code Injection via model_type in config.json

High 8.1

In plain English

A high-severity code injection in unsloth from unslothai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.4%top 64.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
unslothai	unsloth-zoo	2025.9.9 – before 2026.8.14
unslothai	unsloth	2025.9.9 – before 2026.8.20

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References

Pull Request (1) patch, issue-tracking
Pull Request (2) patch, issue-tracking
Unsloth Zoo Dependency Bump patch
https://www.vulncheck.com/advisories/unsloth-zoo-code-injection-via-model-type-in-config-json third-party-advisory