CVE-2026-6855 Instructlab: instructlab: path traversal allows arbitrary directory creation and file write
A local attacker can exploit a path traversal flaw in InstructLab to create directories and write files to arbitrary locations, leading to unauthorized data modification or disclosure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6855?
CVE-2026-6855 is a high-severity path traversal vulnerability in Red Hat Enterprise Linux AI (RHEL AI) 3, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-6855?
3 open source packages ship an affected version, including instructlab. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
instructlab PyPI | All versions to 0.26.1 | None |
instructlab PyPI | All versions to 0.26.1 | None |
instructlab PyPI | All versions to 0.26.1 | None |
Products include Redhat Enterprise Linux Ai, Redhat Instructlab.
How do I fix CVE-2026-6855?
No fix has been published for CVE-2026-6855 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-6855 being exploited?
There is no known exploitation of CVE-2026-6855 in the wild and no public exploit code.
Other vulnerabilities in Red Hat Enterprise Linux AI (RHEL AI) 3
Sources
Also known as GHSA-pqmg-c2j8-fq92, PYSEC-2026-2521.