Vulnerabilities in pkg:pypi/instructlab

PACKAGE

Advisory Identifier: GHSA-rxpq-xgqx-fr7p

Advisory Summary

CVE-2026-6859 is a HIGH (CVSS 8.8) instructlab includes functionality from untrusted vulnerability (CWE-829: Inclusion of Functionality from Untrusted Control Sphere) affecting Instructlab libraries in the PyPI ecosystem. The issue involves instructlab includes functionality from untrusted control sphere. Remediation is available in the latest vendor maintenance releases.

2 Known Advisory Record(s)

Package Vulnerability Intelligence

pkg:pypi/instructlab

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/instructlab. Select an advisory below to view technical details or fixes.

Advisory ID	CVE / NVD	Severity	Summary
GHSA-rxpq-xgqx-fr7p	CVE-2026-6859	HIGH	InstructLab Includes Functionality from Untrusted Control Sphere
GHSA-pqmg-c2j8-fq92	CVE-2026-6855	HIGH	InstructLab vulnerable to Path Traversal

CVE-2026-6859 at a Glance

CVE Identifier CVE-2026-6859

GHSA Identifier GHSA-rxpq-xgqx-fr7p

Severity HIGH

CVSS v3.1 Base Score 8.8

CWE Classification CWE-829: Inclusion of Functionality from Untrusted Control Sphere

Affected Product Instructlab

Package Ecosystem PyPI

Published Date 2026-04-22

Last Updated 2026-04-29

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction Required (UI:R)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability High (A:H)

How to Fix CVE-2026-6859

To remediate this vulnerability, upgrade all affected Instructlab dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

instructlab fixed: Latest secure release

pip install instructlab>=Latest secure release

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

pip show instructlab

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-6859, inspect your installed packages using pip:

pip show instructlab

Analyze the terminal output to locate any version of Instructlab in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show instructlab command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-829: Inclusion of Functionality from Untrusted Control Sphere, where the product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere. In Instructlab, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-6859 Affected Instructlab Versions

1 component(s)

Product / Package	Ecosystem	Affected Versions	Fixed Version
instructlab pypi/instructlab	PyPI	≤ 0.26.1

References

NVD — CVE-2026-6859 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-6859

Instructlab Security Information SECURITY

https://access.redhat.com/security/cve/CVE-2026-6859

bugzilla.redhat.com/show_bug.cgi WEB

https://bugzilla.redhat.com/show_bug.cgi?id=2459998

Instructlab Source Repository REPOSITORY

https://github.com/instructlab/instructlab

Frequently Asked Questions

What is CVE-2026-6859?

CVE-2026-6859 is a security vulnerability in Instructlab involving InstructLab Includes Functionality from Untrusted Control Sphere under CWE-829: Inclusion of Functionality from Untrusted Control Sphere.

Which Instructlab versions are affected?

Affected versions include releases prior to current release patches across affected packages: instructlab.

What version fixes CVE-2026-6859?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

Is instructlab affected?

Yes, instructlab is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

What is the CVSS score of CVE-2026-6859?

CVE-2026-6859 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2026-6859?

CVE-2026-6859 is classified under CWE-829: Inclusion of Functionality from Untrusted Control Sphere (The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.).

How can I check PyPI dependencies for CVE-2026-6859?

Run the dependency tree command: 'pip show instructlab'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rxpq-xgqx-fr7p",
  "modified" : "2026-04-29T22:08:37Z",
  "published" : "2026-04-22T15:31:45Z",
  "aliases" : [ "CVE-2026-6859" ],
  "summary" : "InstructLab Includes Functionality from Untrusted Control Sphere",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "instructlab"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.26.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-6859"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-6859"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2459998"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/instructlab/instructlab"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-829" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-29T22:08:37Z",
    "nvd_published_at" : "2026-04-22T14:17:07Z"
  }
}

CVSS V3

8.8 HIGH