Vulnerability · Published Oct 31, 2026 · Assigned by CPANSec
CVE-2026-78189WebDyne versions from 3.007 before 3.022 for Perl execute .psp files outside the document root via path traversal in the PSGI API route fallback
Unrated
In plain English
A path traversal in WebDyne. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Official description
WebDyne versions from 3.007 before 3.022 for Perl execute .psp files outside the document root via path traversal in the PSGI API route fallback. When a request matches no file, the PSGI handler retries it as an API route through api_filename. That keeps .. segments in the request path and only checks that the joined path starts with the document root, which a request for /../private passes. A remote attacker can run the embedded Perl in any .psp file the server can read, such as one uploaded to a directory outside the document root.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WebDyne | 3.007 – before 3.022 |
Weakness: CWE-22