GHSA-PQ2F-X424-6FJM
Vulnerability from github – Published: 2026-05-12 18:30 – Updated: 2026-05-27 22:09The mamba language model framework thru 2.2.6 is vulnerable to insecure deserialization (CWE-502) when loading pre-trained models from HuggingFace Hub. The MambaLMHeadModel.from_pretrained() method uses torch.load() to load the pytorch_model.bin weight file without enabling the security-restrictive weights_only=True parameter. This allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by publishing a malicious model repository on HuggingFace Hub. When a victim loads a model from this repository, arbitrary code is executed on the victim's system in the context of the mamba process.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "mamba-ssm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "2.2.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-31239"
],
"database_specific": {
"cwe_ids": [
"CWE-502"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-27T22:09:56Z",
"nvd_published_at": "2026-05-12T18:16:52Z",
"severity": "CRITICAL"
},
"details": "The mamba language model framework thru 2.2.6 is vulnerable to insecure deserialization (CWE-502) when loading pre-trained models from HuggingFace Hub. The MambaLMHeadModel.from_pretrained() method uses torch.load() to load the pytorch_model.bin weight file without enabling the security-restrictive weights_only=True parameter. This allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by publishing a malicious model repository on HuggingFace Hub. When a victim loads a model from this repository, arbitrary code is executed on the victim\u0027s system in the context of the mamba process.",
"id": "GHSA-pq2f-x424-6fjm",
"modified": "2026-05-27T22:09:56Z",
"published": "2026-05-12T18:30:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31239"
},
{
"type": "PACKAGE",
"url": "https://github.com/state-spaces/mamba"
},
{
"type": "WEB",
"url": "https://www.notion.so/CVE-2026-31239-35d1e1393188810d9baedfbd8363f396"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "mamba language model framework vulnerable to insecure deserialization when loading pre-trained models from HuggingFace Hub"
}
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