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CVE-2026-31239 — Vulnerability in mamba-ssm — CVE Details

CRITICAL

mamba language model framework vulnerable to insecure deserialization when loading pre-trained models from HuggingFace Hub

Published May 12, 2026Updated June 29, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published May 12, 2026 (153 days ago).
  • Last revised June 29, 2026 — 48 days after initial publication.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
mamba-ssm
pypi
1.0.1, 1.1.0, 1.1.1, 1.1.2 (+18 more)Range-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-31239?
mamba language model framework vulnerable to insecure deserialization when loading pre-trained models from HuggingFace Hub This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-31239?
CVE-2026-31239 affects mamba-ssm. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-31239 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-pq2f-x424-6fjm
PYSEC-2026-406

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