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Vulnerability record · CVE-2026-6859 · published 22 April 2026

CVE-2026-6859: Redhat instructlab inclusion from untrusted sphere vulnerability

Redhat · Instructlab

A flaw was found in InstructLab. The `linux_train.py` script hardcodes `trust_remote_code=True` when loading models from HuggingFace. This allows a remote attacker to achieve arbitrary Python code execution by convincing a user to run `ilab train/download/generate` with a specially crafted malicious model from the HuggingFace Hub. This vulnerability can lead to complete system compromise.

8.8 CVSS 3.1 High EPSS 0.77% · top 46.3% CWE-829 · Inclusion from untrusted sphere
8.8CVSS 3.1 base score
0.77%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
5References
15 Jul 2026Last modified by NVD

Description

A flaw was found in InstructLab. The `linux_train.py` script hardcodes `trust_remote_code=True` when loading models from HuggingFace. This allows a remote attacker to achieve arbitrary Python code execution by convincing a user to run `ilab train/download/generate` with a specially crafted malicious model from the HuggingFace Hub. This vulnerability can lead to complete system compromise.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-6859 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2459998 Issue TrackingVendor Advisory
https://access.redhat.com/security/cve/CVE-2026-6859 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2459998 Issue TrackingVendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6859.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-6859), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.