CVE-2026-6855
CVE-2026-6855 is a high-severity vulnerability in Redhat Instructlab with a CVSS 3.x base score of 7.1. 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-22.
Key facts
- Severity: High (CVSS 3.x base score 7.1)
- EPSS exploit prediction: 0% (6th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-24736
- Weakness: CWE-22
- Affected product: Redhat Instructlab
- Published:
- Last modified:
Description
A flaw was found in InstructLab. A local attacker could exploit a path traversal vulnerability in the chat session handler by manipulating the `logs_dir` parameter. This allows the attacker to create new directories and write files to arbitrary locations on the system, potentially leading to unauthorized data modification or disclosure.
Frequently asked questions
- What is CVE-2026-6855?
- A flaw was found in InstructLab. A local attacker could exploit a path traversal vulnerability in the chat session handler by manipulating the `logs_dir` parameter. This allows the attacker to create new directories and write files to arbitrary locations on the system, potentially leading to unauthorized data modification or disclosure.
- How severe is CVE-2026-6855?
- CVE-2026-6855 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-6855 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-6855?
- CVE-2026-6855 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-2026-6855?
- 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-2026-6855 have an EU (EUVD) identifier?
- Yes. CVE-2026-6855 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24736.
- When was CVE-2026-6855 published?
- CVE-2026-6855 was published on 2026-04-22 and last updated on 2026-06-17.
References
- https://access.redhat.com/security/cve/CVE-2026-6855
- https://bugzilla.redhat.com/show_bug.cgi?id=2460013
Affected products (2)
- cpe:2.3:a:redhat:instructlab:-:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_ai:3.0:*:*:*:*:*:*:*
More vulnerabilities in Redhat Instructlab
- CVE-2026-6859 — High (CVSS 8.8): A flaw was found in InstructLab. The `linux_train.py` script hardcodes `trust_remote_code=True` when loading models…
All CVEs affecting Redhat Instructlab →
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