PT-2026-40126 · Mamba · Mamba

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-31239

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions mamba versions prior to 2.2.7

Description Insecure deserialization occurs when loading pre-trained models from HuggingFace Hub. The MambaLMHeadModel.from pretrained() function uses torch.load() to load the pytorch model.bin weight file without enabling the weights only=True parameter. This allows the deserialization of arbitrary Python objects via the pickle module, which is a process of converting a byte stream back into an object. An attacker can publish a malicious model repository on HuggingFace Hub to execute arbitrary code on a victim's system within the context of the mamba process when the model is loaded.

Recommendations Update to version 2.2.7 or later.

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-31239

GHSA-PQ2F-X424-6FJM

Affected Products

Mamba

References · 4

• https://osv.dev/vulnerability/GHSA-pq2f-x424-6fjm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31239 · Security Note
• https://github.com/state-spaces/mamba · Note
• https://notion.so/CVE-2026-31239-35d1e1393188810d9baedfbd8363f396 · Note