CVE-2026-40086 Rembg has a Path Traversal via Custom Model Loading
Unauthenticated attackers can read arbitrary files from the server filesystem via a crafted model_path parameter in the Rembg HTTP server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40086?
CVE-2026-40086 is a medium-severity path traversal vulnerability in danielgatis rembg, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Rembg is a tool to remove images background. Prior to 2.0.75, a path traversal vulnerability in the rembg HTTP server allows unauthenticated remote attackers to read arbitrary files from the server's filesystem. By sending a crafted request with a malicious model_path parameter, an attacker can force the server to attempt loading any file as an ONNX model, revealing file existence, permissions, and potentially file contents through error messages. This vulnerability is fixed in 2.0.75.
Which versions are affected by CVE-2026-40086?
3 open source packages ship an affected version, including rembg. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
rembg PyPI | All versions | 2.0.75 |
rembg PyPI | All versions | 2.0.75 |
rembg PyPI | All versions | 2.0.75 |
Products include Danielgatis Rembg.
How do I fix CVE-2026-40086?
Upgrade rembg to 2.0.75 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-40086 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40086 exists.
Other vulnerabilities in danielgatis rembg
Sources
Also known as GHSA-3wqj-33cg-xc48, PYSEC-2026-2274.