{"id":"PYSEC-2026-406","summary":"mamba language model framework vulnerable to insecure deserialization when loading pre-trained models from HuggingFace Hub","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's system in the context of the mamba process.","aliases":["CVE-2026-31239","GHSA-pq2f-x424-6fjm"],"modified":"2026-07-01T20:22:56.958502Z","published":"2026-06-29T11:50:49.341783Z","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"},{"type":"PACKAGE","url":"https://pypi.org/project/mamba-ssm"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-pq2f-x424-6fjm"}],"affected":[{"package":{"name":"mamba-ssm","ecosystem":"PyPI","purl":"pkg:pypi/mamba-ssm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.2.6"}]}],"versions":["1.0.1","1.1.0","1.1.1","1.1.2","1.1.3.post1","1.1.4","1.2.0","1.2.0.post1","1.2.1","1.2.2","2.0.0","2.0.1","2.0.2","2.0.3","2.0.4","2.1.0","2.2.0","2.2.1","2.2.2","2.2.3.post2","2.2.4","2.2.5"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/mamba-ssm/PYSEC-2026-406.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}