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High, CVSS 8.8amended

InstructLab Includes Functionality from Untrusted Control Sphere

CVE-2026-6859GHSA-rxpq-xgqx-fr7p

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI instructlab

    Affected
    <= 0.26.1
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
  • CVE-2026-6859: 0.44% estimated exploitation activity in the next 30 days; percentile 38.37 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

A flaw was found in InstructLab. The linuxtrain.py script hardcodes trustremotecode=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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-rxpq-xgqx-fr7p

  2. Revision 1 · created ·

    Published from osv record GHSA-rxpq-xgqx-fr7p

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-6859

Advisory: InstructLab Includes Functionality from Untrusted Control Sphere
IDs: CVE-2026-6859, GHSA-rxpq-xgqx-fr7p
Record: https://patchnext.com/advisories/cve-2026-6859 (revision 2, source checked 26 Oct 2026, 13:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI instructlab: affected <= 0.26.1

## Suggested inspection (read-only)
- `python -m pip show instructlab`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on instructlab.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-rxpq-xgqx-fr7p (OSV record GHSA-rxpq-xgqx-fr7p lists affected ranges: PyPI instructlab >=0 <=0.26.1)
- Verified: https://github.com/advisories/GHSA-rxpq-xgqx-fr7p (GitHub-reviewed advisory GHSA-rxpq-xgqx-fr7p lists affected ranges: PyPI instructlab >=0 <=0.26.1)

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