High

InstructLab vulnerable to Path Traversal

  • Disclosed: 22.04.2026
  • Updated: 11.10.2026 14:18

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.

Affected software

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PlatformPackageVulnerable versionsFixed in
Python (PyPI) instructlab <= 0.26.1 no fix

References

CVSS score 7.1/10
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE)
CWE-22
Platform
Python (PyPI)
Package
instructlab
Disclosed
22.04.2026
Updated
11.10.2026 14:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-2521 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-pqmg-c2j8-fq92 - CC BY 4.0

Vulnerability history: instructlab

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries
2
First → latest
04.2026 04.2026
Without a fix
2
Exploited in attacks
0

Severity breakdown

  • High 2

Disclosures per year

  1. 2026: 2
  1. High · 8.8 CVE-2026-6859 <= 0.26.1 no fix
  2. InstructLab vulnerable to Path Traversal this entry
    High · 7.1 CVE-2026-6855 <= 0.26.1 no fix

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