Advisory record · GHSA-pq2f-x424-6fjm

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

CVSS 9.8 CriticalCriticalEPSS 0.0041 · 35th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 29 Jun 2026, 11:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
mamba-ssmPyPI<=2.2.6No fixed version yet
Identifiers
GHSA-pq2f-x424-6fjm · CVE-2026-31239 · PYSEC-2026-406
Weakness (CWE)
CWE-502
Published
29 Jun 2026
Updated
1 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of mamba-ssm up to and including 2.2.6 are affected. The MambaLMHeadModel.from_pretrained() method loads pytorch_model.bin with torch.load() without weights_only=True, so it can deserialize arbitrary pickled Python objects. An attacker who publishes a malicious model repository on HuggingFace Hub can run arbitrary code when a victim loads a model from it. No fixed version is listed. Avoid loading model repositories from untrusted sources.

Written 10 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H OSV
  • CISA KEV Not listed.
  • EPSS 0.0041, the 35th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 29 Jun 2026. New records show when each source confirmed them.

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.