How severe is CVE-2026-6859?

CVE-2026-6859 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-6859 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6859?

CVE-2026-6859 primarily affects Redhat Instructlab. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-6859?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-6859 have an EU (EUVD) identifier?

Yes. CVE-2026-6859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24752.

When was CVE-2026-6859 published?

CVE-2026-6859 was published on 2026-04-22 and last updated on 2026-06-30.

CVE-2026-6859

CVE-2026-6859 is a high-severity vulnerability in Redhat Instructlab with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-829.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24752
Weakness: CWE-829
Affected product: Redhat Instructlab
Published: 2026-04-22
Last modified: 2026-06-30

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.

Frequently asked questions

What is CVE-2026-6859?: 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.
How severe is CVE-2026-6859?: CVE-2026-6859 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-6859 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6859?: CVE-2026-6859 primarily affects Redhat Instructlab. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-6859?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-6859 have an EU (EUVD) identifier?: Yes. CVE-2026-6859 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24752.
When was CVE-2026-6859 published?: CVE-2026-6859 was published on 2026-04-22 and last updated on 2026-06-30.

References

Affected products (2)

cpe:2.3:a:redhat:instructlab:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_ai:3.0:*:*:*:*:*:*:*

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