Unsloth Zoo Code Injection via model_type in config.json
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-93348
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 02:53 UTC · Revision 1
Source evidence
Unsloth Zoo Code Injection via model_type in config.json
core-osv · Original sourcePublished 28 Sept 2026, 15:09 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.
osv:CVE-2026-93348
Complete source record
{
"id": "b1a2c363eddd2bde23f480430be4ce00fd1d0d9ba311baa01ee0eecb485b678d",
"url": "https://osv.dev/vulnerability/CVE-2026-93348",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Unsloth Zoo Code Injection via model_type in config.json",
"summary": "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.",
"evidence": "osv:CVE-2026-93348",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-93348",
"aliases": [
"CVE-2026-93348"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/unslothai/unsloth",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "92ee0207a38ebc8af1a0e678aa92d7e7d901ea0d"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"fixed": "92ee0207a38ebc8af1a0e678aa92d7e7d901ea0d"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v0.1.801-beta",
"v0.1.800-beta",
"v0.1.71-beta",
"v0.1.702-beta",
"v0.1.701-beta",
"v0.1.70-beta",
"v0.1.62-beta",
"v0.1.61-beta",
"v0.1.60-beta",
"desktop-v0.1.527-beta",
"v0.1.527-beta",
"desktop-v0.1.526-beta",
"v0.1.526-beta",
"v0.1.525-beta",
"v0.1.524-beta",
"v0.1.523-beta",
"v0.1.522-beta",
"v0.1.521-beta",
"v0.1.52-beta",
"v0.1.512-beta",
"v0.1.511-beta",
"v0.1.51-beta",
"v0.1.501-beta",
"v0.1.50-beta",
"v0.1.49-beta",
"v0.1.481-beta",
"v0.1.48-beta",
"v0.1.471-beta",
"v0.1.47-beta",
"v0.1.464-beta",
"v0.1.463-beta",
"v0.1.462-beta",
"v0.1.46-beta",
"v0.1.451-beta",
"v0.1.45-beta",
"v0.1.44-beta",
"v0.1.431-beta",
"v0.1.43-beta",
"v0.1.42-beta",
"v0.1.416-beta",
"v0.1.415-beta",
"v0.1.41-beta",
"v0.1.405-beta",
"v0.1.40-beta",
"v0.1.39-beta",
"v0.1.38-beta",
"v0.1.37-beta",
"v0.1.36-beta",
"v0.1.35-beta",
"v0.1.3-beta",
"v0.1.25-beta",
"v0.1.2-beta",
"b8475",
"b8457",
"v0.1.0-beta",
"March-2026"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93348.json"
}
}
],
"modified": "2026-10-28T02:30:49.314240556Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93348.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-93348",
"https://www.vulncheck.com/advisories/unsloth-zoo-code-injection-via-model-type-in-config-json",
"https://github.com/unslothai/unsloth-zoo/pull/1083",
"https://github.com/unslothai/unsloth-zoo/pull/1108",
"https://github.com/unslothai/unsloth/commit/92ee0207a38ebc8af1a0e678aa92d7e7d901ea0d",
"https://github.com/unslothai/unsloth",
"https://github.com/unslothai/unsloth-zoo"
],
"provider_metadata": {
"cwe_ids": [
"CWE-94"
],
"cna_assigner": "VulnCheck",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "2025.9.9"
},
{
"fixed": "2026.8.14"
},
{
"introduced": "2025.9.9"
},
{
"fixed": "2026.8.20"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "2025.9.9"
},
{
"fixed": "2026.8.14"
},
{
"introduced": "2025.9.9"
},
{
"last_affected": "2026.8.19"
}
],
"source": "DESCRIPTION"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93348.json"
}
},
"related_cves": [
{
"value": "CVE-2026-93348",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517521,
"published_at": "2026-09-28T15:09:41.524+00:00"
}