CVE-2026-8387 Relative Path Traversal in allegroai/clearml
Attackers can exploit relative path traversal in ClearML to write arbitrary files, potentially leading to remote code execution via dataset or artifact downloads.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-8387?
CVE-2026-8387 is a low-severity path traversal vulnerability in allegroai/clearml, published on 1 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
A vulnerability in allegroai/clearml versions up to and including 1.16.5 allows for relative path traversal when extracting `.zip` archives using the `ZipFile.extractall()` method in `StorageManager._extract_to_cache()`. This issue arises due to the lack of path traversal validation, enabling an attacker to write arbitrary files to the filesystem. Attack vectors include dataset downloads, artifact downloads, model downloads, and offline session imports. The vulnerability can lead to remote code execution through methods such as cron job injection, SSH key overwrite, or web shell deployment. The issue is resolved in version 2.1.6.
Weakness: CWE-23
Which versions are affected by CVE-2026-8387?
How do I fix CVE-2026-8387?
No fix has been published for CVE-2026-8387 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-2026-8387 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8387 exists.
Sources
Also known as GHSA-mhhg-pjm8-92vh.