CVE-2026-6855

Instructlab: instructlab: path traversal allows arbitrary directory creation and file write

7.1 High

CVE-2026-6855 is a high vulnerability (CVSS 7.1) in Redhat Instructlab, published April 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 5th percentile. No source names a fixed version.

What does this mean?

Severity: 7.1 HighCVSS 3.1, CVE List
Exploit chance: 0.16%EPSS, 5th percentile
Exploitation: None knownNot on CISA’s or ENISA’s lists
Fixed in: No fix listedNo source names one

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

0.16%Up 0.1 points since Apr 23, 2026

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`instructlab` PyPI	through 0.26.1	None known
`instructlab` PyPI	through 0.26.1, plus listed versions 0.14.00.15.10.16.00.16.10.17.0 Show 45 moreShow less 0.17.10.17.20.18.00.18.0a10.18.0a20.18.0a30.18.0a40.18.0a50.18.0a60.18.0a70.18.0b10.18.0b20.18.0b30.18.0b40.18.0b50.18.0b60.18.0rc10.18.0rc20.18.0rc30.18.0rc40.18.0rc50.18.0rc60.18.0rc70.18.10.18.20.18.30.18.40.19.00.19.0a10.19.0b10.19.0rc10.19.10.19.20.19.30.19.40.19.50.20.00.20.0a10.20.0a20.20.10.21.00.21.0a00.21.0a10.21.10.21.2	None known