CVE-2026-40035 Unfurl - Werkzeug Debugger Exposure via String Config Parsing
Attackers can access the Werkzeug debugger due to improper config parsing, leading to remote code execution or sensitive data disclosure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40035?
CVE-2026-40035 is a critical vulnerability in obsidianforensics unfurl, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unfurl through 2025.08 contains an improper input validation vulnerability in config parsing that enables Flask debug mode by default. The debug configuration value is read as a string and passed directly to app.run(), causing any non-empty string to evaluate truthy, allowing attackers to access the Werkzeug debugger and disclose sensitive information or achieve remote code execution.
Weakness: CWE-489
Which versions are affected by CVE-2026-40035?
2 open source packages ship an affected version, including dfir-unfurl. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
dfir-unfurl PyPI | All versions to 20250810 | None |
dfir-unfurl PyPI | All versions to 20250810 | None |
Products include Ryandfir Unfurl.
How do I fix CVE-2026-40035?
No fix has been published for CVE-2026-40035 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-40035 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40035 exists.
Other vulnerabilities in obsidianforensics unfurl
Sources
Also known as GHSA-92wx-pxch-p9px, GHSA-vg9h-jx4v-cwx2.